Oh, I'm not attempting a static diver yet. I haven't even trimmed the single-prop sub (dynamic diver planned) I've just managed to get forward drive into. It's not a Lionfish, but a single-prop nuke. But I'm with you in interest on scratchbuilt static divers: If I get this boat to handle well as a dynamic diver, I'd like to put a ballast tank into it (cheaply).