OK, The Hall Park book on the Swordfish, here, has drawings and sections of the floats, but not dimensioned. How accurate these drawings may be, I have no idea.
Well here you go then. Scanned from this Kelsey Media book. (This may or may not be the final configuration, still checking.) This photo has also apparently been retouched.
Cannon cover is OK for a G,... not so OK for a K.
After the addition of some epoxy putty. This shape now seems much more consistent with reality. I'll now have to shorten front end and add more details, but I'm much happier with this new configuration.