Digital scanning is such a dream come true, so I'm entering this old work.
"If I were to participate in a Gunpla battle," I thought, I'd go with my favorite ZZ base, customizing it with elementary school-level thinking, not sacrificing mobility as much as the Full Armor, but increasing firepower.
I thought the ReZEL's shins looked similar to the Full Armor ZZ, so I used the ReZEL for parts, and added the optional Powered Arms Powerder and Mega Ride Launcher (x2), and built it with adult financial means.
It's not so much a personal preference, but since I made it with the "Gunpla battle" in mind, I wanted it to be digitally scanned.

GUNDAM ZZ BOOST | しばまる's Gunpla works