Well, I think I'll finish by talking about what I've got at home right now. About two years ago, my best friend wanted to have a model of the Montana. At that time, there were no kits available. All we could think of doing was taking a TAMIYA 1/350 IOWA battleship and lengthening and widening that. Fortuneately, fate smiled on us......sort of. Someone decided to make a 1/350 resin hull for us. We gladly accepted the offer. However, when we got the hull, there were some problems. I won't go into a long story about why the hull is the way it is in the pics; apparently, the person who made the hull had some problems with the casting process. I don't remember. But still, we decided to keep the hull as it was our only option. Besides, it gives me practice and experience working with resin. It's one big learning curve.





And here's some pics of the difference in length and width between the resin hull and a TAMIYA 1/350 Iowa hull. The resin hull is 32" long and 4" wide.


And here's some pics where I took some of the TAMIYA battleship parts and laid them on the resin hull to figure out how I was going to plan everything out. Nothing is glued on the hull; the parts are just sitting there. This does not depict how the final version of the layout will look. This is only temporary. Everything is subject to change.



For anyone who is thinking of trying to convert a 1/350 TAMIYA Iowa class battleship into the Montana, here are some measurements that I got from a friend at work two years ago when I originally thought about converting a TAMIYA kit.
"To confirm, the Montana is 921' long and 121' wide, thus at 1/350 scale it will be 31.577" long and 4.149" wide. The Iowa is 887' long and 108' wide, thus at 1/350 scale it will be 30.411" long and 3.703" wide. The difference is 1.166" in length and 0.446" in width. To simplify, 1.125 is exactly 1 1/8", thus 1.166 is close enough to use 1 1/8. 0.500 is exactly 1/2", so 0.446 is close enough. Simply lengthen the TAMIYA hull by 1 1/8" and widen the hull by 1/2" (1/4" on each side.) However, where you decide to cut and lengthen the TAMIYA hull is up to you. I have no answers for that.
EDIT: And yes, for those who are wondering, I do plan to use extra IOWA parts from extra TAMIYA Missouri kits to build the Montana. Neither me nor my best friend have a lot of money to afford photoetch, brass barrels, and all sorts of other fancy accessories. My friend gave me two extra Missouri kits to rob parts from, and then I'll use what's leftover in those kits to make some other What If battleships. Parts that I'll be using are:
16" turrets.
5" guns
40mm tubs and guns.
20mm galleries and guns.
Ship's boats.
Searchlights
Various superstructure parts. (Too many to list.)
All gunfire control directors.
Seaplanes, crane, and catapults.
Life rafts.
Photoetch that I'll probably use if/when I have the money. (Gold Medal Models)
WWII Battleship Missouri Upgrade Set x1
Gold Plus Missouri Fine Details set x1
Extra Ladders set x2
40mm & 20mm gun Detail Set x1
Watertight Doors set x2
Assorted Cable Reels set x1
WWII USN Floater Net Baskets set x1
The ship will probably have a Measure 22 paint scheme and will be displayed on a water base.