Does anyone know where I can get some of the old fin box style fins?

I have an older board that's a bit of a favourite and the only fins I can find for it are those crappy plastic moulded ones that flex too much when loaded. I would like to try a set of stiffer fins. The side ones are 3 1/2 inches deep (90mm) and the centre 4 1/4 inches (110mm). I want to try the same size and see how much of a difference there is.

For those that havent seen the crazy boards Stu kennedy das been riding lately check out:

tomosurfboards.com/home.html

Since i'm bored at work, I was reading Dan Thomsons Blog.
dantomo.blogspot.com/
I'm now considering buying an old 6'6-6'8 and doing a nose and tail chop. Preferably a board with a bit of volume coz i'm pretty unfit right now an need volume.
Maybe use some paulonia wood on the nose and tail for the reinforcements and reshaping, thus leaving only the most parallel parts of the board.
I was thinking of making a 5'10-6'0 by 19" if possible.

I'm real curious about the tomohawk fins i've seen on the blog too.
Has anyone seen the for sale anyhwere or will i have to try and make my own?

Anyone else have some crazy ideas like this recently?