Dean, I just read your WindriderRave forum posts. Just compare the size of the relatively small Rave main and tiny jib with a big Prindle 19 sail and mast. I believe that there is absolutely no problem with P19 hull strength: I'm not talking about stupidly duct-taping a P19 hull under the existing rig, but why not just do it? You needn't change much of anything else, IMHO, except stabilize the rear end of the longer hull. Sitting on one place on top = good, hull-top **** = good?, scuttling around to manage all the strings and feet/rudders too = bad.
Now if you want to sail hydrofoils really well, you can simply get rid of the troublesome yellow plastic amas and even more unhydrodynamic center hull, by replacing the amas with 2 lovely, shapely P19 hulls! That's one on each side! Ooops, meddling again!
Well I'm off to the Wildcat now to zoom around with the other little A-cats this weekend, and Wild-Thing practice. We still have a breeze fron the backside of Rita. Enjoy your Cad-Cam sessions and odor of warm yaller polyethylene.