Any thoughts on this dinghy;

http://www.stevproj.com/FastSailrs.html

Its the second one down on the page, the 'mini cup'. You have to
download a 2mb pdf file to see all the plans for it (which are free),
but there are a couple of pictures you can see if you click on the link
for pictures. It looks a lot faster than the scows Ive been looking
at, and not really too much harder to build.... but the sail! Horror
of horrors, its a nasty looking piece of work, but will it work?

The wing dinghy on the same page at the top looks like a lot more fun,
but a bit more work to build also. The plans are cheap enough at $25,
but they're out of stock :-(

Thanks,
Shaun