Whilst not claiming that Wikipedia is always accurate, if someone is wanting to model a Halifax as a Mk V Series 1, then the following excerpt may be of interest. You will note that the major difference between a Mk II and a Mk V is down to the undercarriage. Messier undercarriage on Mk II and a Dowty (Lancaster type) undercarriage for Mk V. Owing to the u/cart being cast, this reduced the overall load, hence the diversion of Mk V from bomber to maritime patrols and training where heavy bomb loads were not the main consideration.
Introduction of 1,390 hp (1,040 kW) Merlin XX engines and a twin .303 in (7.7 mm) dorsal turret instead of waist guns resulted in the B Mk II Series I Halifax. The Mk II Series I (Special) achieved improved performance by removing the nose and dorsal turrets. The Mk II Series IA had a moulded Perspex nose (the standard for future Halifax variants), a four-gun Defiant-type dorsal turret, Merlin 22 engines and larger vertical tail surfaces which solved control deficiencies (rudder-stall) in the early Marks. Halifax IIs were built by English Electric and Handley Page; 200 and 100 aircraft respectively.
Due to a shortage in Messier-built landing gear and hydraulics, Dowty landing gear were used. Being incompatible with the Messier equipment these gave Halifaxes with new designations. A Mark II built with Dowty gear was the Mark V. The use of castings rather than forgings in the Dowty undercarriage speeded production but resulted in a reduced landing weight of 40,000 lb (18,000 kg). The Mark V were built by Rootes Group at Speke and Fairey at Stockport and were generally used by Coastal Command and for training. Some 904 were built by the time Mark V production ended at the start of 1944, compared to 1,966 Mk II.
The link shows a Merlin engined Halifax with a solid nose and no mid upper turret, and the original triangular fins. However many modifications were undertaken whilst in service, the major being slab sided rudders, which I think would be a priority for a training aircraft to avoid the instability problems of the earlier shape rudder. As to whether there was a plexiglass nose and/or mid upper, you may need to research the crew numbers. Better yet, try and get a contemporary photo!!
By using the power of Google (try it - it doesn't hurt!!) I also found this entry in Brian Pears Diary
For the sake of ensuring they get due credit, I provide the link to the website:
http://www.bpears.org.uk/NE-Diary/Inc/ISeq_36.html
Saturday, 15th/Sunday, 16th April 1944 N1687
Two Handley Page Halifax bombers crashed while attempting to land at Dishforth Aerodrome. (The following reports were kindly supplied by Mr Leslie Green of Weston-super-Mare and Keith E Whitfield of Thunderbridge, Huddersfield.)
Operational Record Book, RCAF Dishforth "Flying weather for the past week has been only fair with the result training has been held back considerably. To add to this, six of our aircraft returning from a short cross country arrived here during rain and thunderstorms. Two aircraft managed to land here and two more at Linton, but the other two crashed, killing twelve of the two crews, as well as two civilians."
Halifax EB203
"Halifax EB203 crashed into a haystack near Ripon at approx. 23.25 hours and burned. The crew as listed were all killed."
They were Top/Sgt. Wendell N Watkins USAAF age 21; F/O H. A. Wallace J/23362 RCAF age 32; Sgt. H.L. Muisiner R/160427 RCAF age 23 (American from Pennsylvania); W/O Class 1 J Huddleston R/106580 RCAF age 20 (American from Oregon); Sgt. K.D.Holden 2209731 RAF age 20; Sgt. L.J.Cull R/200097 RCAF age 18; Sgt. C.E. Lovett R/208139 RCAF age 18
The five RCAF crew are buried at Harrogate (Stonefall) and the RAF Flight Engineer at Tyldesley Cemetery in Lancashire. The American pilot's body was taken back to the USA in 1948.
Halifax EB205
"Sent out on a routine training flight, April 15th 1944, Halifax EB 205 encountered bad weather. At one point, the crew were ordered to stand down but later ordered to fly above the storm that was due to hit the area later that day. The flight went well and they could see the storm gathering below. On returning to base at approx 2300 hrs they hit the full force of the storm. As they were preparing to land at Dishforth, both port engines had cut. The pilot radioed ahead, and he was given priority to land. Cloud cover was down to 500ft over Dishforth, on breaking cloud cover they realised they had overshot. The pilot decided to put down at the nearby Topcliffe aerodrome and was approaching there with a 10mph tailwind. As a precaution the crew were ordered to take up crash positions. The MUG John Tynski came down from his position and laid down on the floor with his parachute over his head . The aircraft careered off the end of the runway and into the railway cottages close to the road. Five crew and three civilians were also killed, one of those a James MacNulty was killed, as he was cycling by at the time. The occupants of the house Mr and Mrs Stone were also killed. John Tynski having been knocked unconscious, came to trapped by all the building rubble. On fire, and fearing for his life, his first thoughts were to gather the ammunition that had spilled from the containers and move it away from the fire.
At risk of being burned alive he then made up a makeshift wall from the brick rubble that lay all around to shield him from the heat. At this point he could hear help arriving from local farmers Rooke and Starr, who eventually dragged him to safety. It was later discovered by an accident investigation team, that the Flight Engineer had inadvertantly turned the fuel off on the port engines thus contributing to the accident. [Four of] the crew are buried at the Stonefall Cemetery Harrogate [and one at Wandsworth (Streatham) Cemetery]. Harry Pearce, navigator, also survived but was later killed over Belgium Dec 18th 1944."
Night 1687. All times DST. Blackout begins: 21.39, ends: 06.32
As the reference in EB205 specifically states the Mid Upper Gunner, then I would suggest that was the same for EB203, as training crews would probably need a MUG when allocated to front line Squadrons. Both aircraft had the "normal" complement of 7 crew, again indicating a mid upper gunner. That would indicate Sgt Cull in that position.
Hope this helps, although you may now have to build both EB203 and EB205!!!!