I have made several "navalized" Bf-109T's,
but one of these days will make my "ultimate" seagoing 109. It will have, however, a RADIAL engine in the same vein as the Japanese Ki-61-to-Ki-100!
Way back in the day, I had made a 1/72 "master" of a Ki-100 for a cottage-industry model company (Model-Aire International--"M.A.I."), but the company folded before the plane came out, and of course Hasegawa came out with a fine version themselves. But I still have the original master, and will incorporate that into my "ultimate 109". I am using a Monogram Snap-Tite 109 for the basis, as it is 1/64 or so, and thus is "roomier" and will allow extra length with add-ons without looking out-of-proportion. (sigh) Don't look for it anytime soon, as I have a long list of projects with greater precedence.
(Will include Me-109H wings, and Me-209 V5 tall tail)