Since Im seeing the Gundam Mk II as a long term project Im switching to the HGUC version of the RGM-79GS GM Command, a Yutaka Izubuchi design from 1989's Gundam 0080: War in the Pocket.
The RGM-79GS GM Command Space Type, a specialized space combat version of the RGM-79G GM Command developed for use on Earth and in colonies. While the Space Type was visually similar to the regular GM Command besides the standard GM paint scheme, the Space Type mounted an enhanced backpack equipped with more maneuvering verniers and more powerful rocket thrusters. By removing equipment not needed in a gravitational environment, more internal space was freed up in the Space Type, allowing it to be equipped with additional verniers and larger fuel propellant tank.
Having done most of a RGM-79D GM Cold District Type, it shares a majority of parts making this seem to fall together.
Adding plastic sheet to the skirt armor to block the empty spaces, forearms yet to be sanded.
The red areas will be painted in a yellow/green mix while the white will be in a light gray.