AT-AT part ID help

[MonsieurTox]

Hey guys, I hope you'll be able to help me with those parts :

On the red part there's a 1/20 F1 part that I colored (my mistake sorry) dont count it.

Thank you for your help !

 

[Scott Graham]

Is this the open area of the top rear? I'm just trying to figure some kind of scale. Can't help with the parts so far. I would have guessed the yellow part was flak 38, but as you say in the other thread it turns out not to be.

It's interesting how toy-like those tabs seem to be on the red part.