Hey guys really glad you like the model, makes all the hard work worthwhile.
On a difficulty scale from 1-10 I'd give it a 9 (10 being totally from scratch, granted that's just my perspective). Pretty much everything had to be modified on this sucker.
I didn't change the actual hip joints, they seem fine.
The arms on both kits (these were the worst)
The front and back chest pieces on both kits
The upper and lower leg pieces on both kits
The lights on the legs
The fast packs on the Arii kit
The backpack on the Hase kit
The Head lasers
The arm missiles were total scratch builds
Scribing all the custom panel lines on the leg missile hatches, arms, and chest
And all the decals I pieced together from different kits (always my favorite part)
Again really glad you all liked the project.