Sounds like an interesting project. In fact if you look at many Sup outlines they have a lot in common already with single fin design. Wide point forward, wider nose etc.

I have a pretty good idea what kind of single fin you are describing below almost like a McCoy or early Wayne lynch style, is that correct? Or kind of like MP morning of the earth type.

You mention TF his boards were quite different to these, pointy nosed speed needles.

If you want to go to 9'4 x 32 you'll need more than 4" of nose rocker as that would be very very flat. If you want the TF style you need a pointier nose and more rocker, if you want he other style these boards were quite short also and like a disc type design.

Easier way would be to speak to a shaper already working in Sup with a good boards building background. They can scale up the design of something you like.

Have a look at the C4 web site,the 8"11 Hipster might be what you are looking at.I've bought 2 back from Hawaii last week.