And now for something completely different......
The upper and lower hull assembly shouldn't be painted at all until AFTER they're put together. On many (not all) military vehicles, some seam filling and or sanding is going to be required where the top meets the bottom. In addition, many of the fiddly bits should also be added prior to painting. Then shoot the model and pick out individual details with a small brush. Things like tow cables, bedrolls, etc. can be added later with a touch of superglue.....but that's the way I do it.
Build 'em like you want and enjoy it. That's why it's a hobby!
By the way, welcome to the forum family! Hope you enjoy your stay!
Gip Winecoff