I recreated the battle scene with the ZEON in a diorama using an early HGUC Z Gundam.
It hasn't been modified much, just painted completely with lacquer and finished with washing and dry brushing (I overdid the dry brushing a bit).
I like the shape because it's close to the original illustration, but the joints don't move much, so the pose in the picture is the best I could do.
By the way, I made a rough look for the ZEON's hidden arm and saber from junk parts (I don't have a ZEON).

Z Gundam Slash | nan_koromaru21's Gunpla works