I managed to paint it. I also did a test assembly to check the joint clearance.
I tried to paint it in a way that resembles the Z Gundam's color scheme, but with subtle AOZ-like touches in the colors and cable colors.
Next, I plan to paint the rifle, do some overall retouching, paint the inside of the armor and panel line, apply decals and a top coat, and then finish it off.

GQ Hambrabi main body painting complete | マシーナリーとも子's Gunpla works