That's measure 22, i can just turn the wull blue like Colosseum 1945 Uss Missouri; for other camouflage jobs (like the measure 32 you also posted) it could be harder, i have never tried before with camo and not using drawing programs with layers (only ms paint) make things more harder.
The 1942 version is just the final design of the Montanas, she has 10 quadruple bofors on paper; the speculative/own design 1945 is based on drawings and the same model you posted above, sporting 19 quadruple bofors (just one less than Iowas), i have saw other models ammassing as much as 31 quadruple bofors mounts (31? thats 124 40mm guns!) wich for me is really too much, i think it's possible to add as much as 6 quadruple mounts at best (3 port and 3 starboard, simmetrycal), but no more (two between turret 4 and aircraft catapults, and another 4 by deleting the boats deck, a-la-Iowas).
Messing with the bofors would be a later thing tough, now i want to focus on the 1947 version with advanced radars and 76mm twins for AA.
(and on a side note, i'ts probably an own design of some sort.. but.. how much is big that BB with measure 32 you posted?
tha'ts clearly way too big even for Montana's size)