Great peping!!!
For your bondoing, if I may give you few suggestion, since I'm doing a Mark IV Ironman Armor myself, and have already started with the bondoing with good results:
- do small amounts of bondo at each time.
- do not resin the outside, apply the bondo directly on the paper.
- apply it on multiple layers, don't try to do it all at ones.
- you should bondo, sand it, then bondo again if needed, sand again... and so on... until you get the wanted result.
The bondoing part is a slow process, we are not talking about a big flat surface (like a car door) but a small twisted shape with lots of details.
Basicly, take your time.