I have an interest in Ford script Jeeps as you know Tom - and certainly in British service a number of script bodied Fords and Willys managed to reach the end of the war without a Jerrycan holder retro-fitted onto the back - you will find pictures in Gavin Birch's book. Incidentally the Ford logo was not hidden by the jerrycan holder - as the Ford pressing was lower down the back panel
The signs look good though - the box-top illustration shows no BO drive light on the LH wing which is correct for an early (MB or) GPW. If the kit includes one, it should have the tombstone, rather than horseshoe shaped guard as the retrofits were the tombstone shape.
Here's a script back panel without the jerrycan holder. Note the 6 horizontal footman's loops (5 with jerrycan)the rubber grommets round the tail lights (omitted when rubber got scarce). There is no trailer socket or eyes on the pintle hook (both retrofitted together). The rear reflectors are in their original high position - they were moved level with the lights when the trailer socket was fitted. The spare wheel carrier has an original locked nut to prevent theft.The two nuts are part of the fixing for the retrofit body strengthening kit between rear panel and wheel arches which was introduced when it was found that the weight of spare wheel etc was fracturing the spotwelds and pulling the back panel away from the body