Nice details David.
I am a bit surprised the back (rear) door was missed as a modelled item on the FOA vehicle. No problem though as these adhoc vehicles could and did have local variations and its one of my favourite vehicles of the war.
The small internal boxed area could easily be knocked up with some plasti card....I'm told superglue can be used for making rivet lines.
Anyway, when you're done pop up a pic
Cheers
Happy W