It's the Knightmare Frame Red Lotus MK-II from the anime series "Code Geass: Lelouch of the Rebellion - The Lost Story".It is made directly from the game files. Its size is roughly the same as an HG Gundam model. I recommend using PETG or ABS for all parts. Some parts may need to be sanded before installation.

You can glue the parts that won't move

Assemble

The main body

Left arm

Right arm

2x for the legs. The "wheels" on the feet need to be glued together.