No idea if this is going to work out or not yet but based on someone's (I forget who) idea I did the following:
measured the ships I have, broken down into classes (e.g)
CAs 3/8"x(2 3/4" - 3")
So I plan on basing them on some flexible steel from Litko 3/4" x 4" ,then buy some flexible magnet strips 1" x 4" to use for nameplates.
Get more nameplates than ships so for example the Tirpitz/Bizmarck I can have one Bizmarck-class BB and 2 nameplates depending on what battle I'm fighting.
Now.. for iconic ships (like the bizmarck) I might actually want one of each so the camo is correct. But for lesser ships probably not.
That's the plan so far. it'll be a while before I get the basing materials and possibly longer before I get to painting.
For Reference (based on RN and KM):
BBs 1/2" x (3 1/2" - 4")
CVs 1/2" x (3 1/2" - 4")
CBs 1/2" x (3 3/4" - 4 1/4" [Hood])
CLs 3/8" x (2 3/4" - 3")
CAs 3/8"x(2 3/4" - 3")
BCs 3/8" x 3"
j.,