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First of all many thanks for your contribution.
I have carefully put everything together according to your instructions. The drawing for the DH E8543 that you posted time ago is very helpful as it contains some of the data you mention.
I had noticed in this drawing the the upper bolt strip seemed to be at a different slope as compared to the DH casting angle indicated beside, 34º 30', which is also different to the known glacis plate angle. I thought it could be my eyes plying tricks, or a distorted copy (this happens). But now everything fits together very very well.
However what affects the vertical positioning has an issue, according to my sketch.
You say that the lower hull height once assembled is 28-13/16. That´s ok afaik and Dragon M4A2 hulls are ok by the way.
You mention the height between Final drive center and lower bolt flange, inside surface, which should touch the low surface of the hull bottom, is 14.204 in.
If I "assemble" the DH to the lower hull using those dimensions (28-16/16 for the hull and 14.204 for the housing) then my bolt strip in the DH results to be "flying" 1/2in over the bolt strip flange, glacis side. If I have time today I´ll prepare an sketch today and update the post.
I think I know why. It seems that the bottom plate of the lower hull was made actually of two pieces. The rear part was 0.5in, while the front one, below the driver and probably as additional protection against mines, was THICKER at 1.0in, the additional thickness being on the outside.
I think the lower hull side plates match the dimension 28-13/16, and the bottom plates in the area 0.5in thick are flush with this dimension, but in the front part the additional bottom plate thickness protrudes out of this dimension by 0.5in.
By the way both Dragon and Tasca kits show this arrangement of additional outer thickness.
If I´m right the DH must be "assembled" using the 14,204in dimension touching to a outer bottom surface located at 28-13/16 + 1/2in. In this condition everything fits with just an small interference at the glacis-DH joint of only 2mm.
Please let me know what you think.
Willing to quickly reach conclusions, Tasca kits (I have one Sherman III), in case all a.m. things are true, have:
1) a slightly too low lower hull side plates, 20,5 mm instead of 20,9mm.
2) a slightly too low DH parts, around 0,5mm, at least the E4186 versions. This is consistent with deviation 1).
Not dramatic though!!
This message has been edited by astursimmer from IP address 126.96.36.199 on May 23, 2012 4:39 AM This message has been edited by astursimmer from IP address 188.8.131.52 on May 23, 2012 4:31 AM