...or a Monster or maybe even the Koenig Monster!! I just saw the Ma.K. kits you mentioned today. The main one I would get is the M61A5 tank with twin cannons but the 9000 yen price tag is a bit of a deterrent for me right now.
OK, here's what I've done so far with the $5 "2-fer" in 1:144. Consider it a "sketch" of what I have in mind for the 1:100 transformable.
As a bonus, here's the Israeli camo VF-11C fighter so far.
There's still some detail work including the wash and decals to go on all of them, along with painting the -11's cockpit.
I went ahead and bid on the auction and the kits should arrive next week. I'll see what the kit is like and plan further detailing from there. At the least, I'm thinking of making a custom gunpod for the "Berkut" styled after an AK-47.