From the modeler…
The frame for the Gusion is actually from Barbatos, just made a few modifications on it so it would fit. Gusion’s colors are two variations of bright red + pure orange, accented with white, and tones of grey for the frame.
For weathering, i used ammo products. I painted the chippings with acrylic dark rust color using no. 0 pointed brush. Accumulated dirt and streaking effects are done with ammo streaking grime, streaking rust, and dark streaking grime. Some filters on the white. oil effects on the joints. finished with pigments (dark earth and track rust).