Conversion of the original-casting fuselage is pretty simple: mainly grinding off the entire belly, right up to the (lower) wing. The canopy gets chopped back with a new windshield formed about 3/4 of the way back over the wing, and the turtleback shaved down a little - not even as much as (mistakenly over-) done here. Finally, the rudder trailing edge gets straightened to be a bit more vertical, and the wing (to become the SeaGull's bottom wing) narrowed by about 1/3 and given just a little sweep-back. I plan to eventually post a conversion/construction-tips page describing all the above, simply and very clearly, with the help of explicit graphics.
Top wings and pontoons (top-left) hadn't yet been mastered for this conversion - so the needed upper wings were hacked from additional HellDiver seconds, and pontoons - both large, main ones and the tiny wingtip floats - were pirated from my OS2U KingFisher, in the same scale.
Note these pics show PE struts for the wing floats in the process of going on (completed at bottom-right). The trick - again, since no struts had (yet) been mastered - was to chop off all but one (the rearmost, vertical) of the molded-in (KingFisher) struts, and use it temporarily for attachment. The angled/inboard struts - "scratch-bashed" segments of of "1-bar" railing, in 540-scale (in truth, a bit on the long side) - wer then fitted. Once this PE was securely hardened in place, the resin strut was then gently, GENTLY whittled away - using an absolutely brand-new/unimagineably sharp X-acto-type Number 11 blade - scraping away gradually, RIGHT AT THE FLOAT - so that, once separated the stick could then be chopped away cleanly and easily, against the wing. Following which, a pair of vertical PE struts (these rectangles cut from some 700-scale float-net baskets) were then glued-in - all of the above using CA, of course - to make for a pretty strong attachment for the wingtip floats.
Note at top-left, on each large, main pontoon all but one of the (three) Kingfisher struts have likewise been removed, in anticipation of exactly the same technique to fit/scratch-bash their PE struts, as (more) accurate for a SeaGull.
This is the point at which I normally would- and so will now take a crack at beginning the final painting - hopefully to stand up well through the subsequent fitting of PE struts to both main pontoons and top wings. Stay tuned…