I havent heard from tom in a while. I think he makes parts but not like he used to. Theres just not enough margin in the parts for most people to have it worth their wild.
Some of the guys who race them use superjet sponsons i think. Not the destroyers. The screw and glue kind. A few people offer them for superjet. I can not say which is best.
After all my workwith the hull and motor, i was happiest with a stock hull and 650 pipe. The hull mods and bigger pipes werent worth the effort. I used to suggest the mods, bht now i say enjoy it for what it is, use it as a hobby backup ski or buy something that works the way you like.