I have been working on the Heller Citroen Bordens milk truck which is pretty much the same kit you have. I also have two copies of the Normande. With the Fotki photo transition, I have gone to my folder for this build and it's empty! So I can't post any photos right now. A few things...
The chassis builds up onto the fender unit. It's difficult to assemble, think very old Revell spindly parts. I have used my drill and pin technique to get it assembled and aligned. Spare tire mount - there is no definite mount point, I drilled and pinned mine. You won't have the issues with the body I had, the Bordens truck is a multi piece body that needs to be built up upon that fender unit. It doesn't really square up well, I would do it different next time. But I'd recommend that you test fit everything! Leave nothing to chance, never assume the parts will fit.
I really like the engine etc on this one. Do a Google search and you will find a lot of photos of 1:1 Citroens of this era. The trucks and cars are off the same base, and the same mechanically. I found a couple of close up engine shots and built mine accordingly.
Good luck! I'll be watching! I have two Normandes. I did steal parts from one to replace parts I broke on the Bordens (yea, those spindly chassis parts!) but I did notice that the Normande body sits on a '34 Ford chassis like it was born there!