Ok,
Check out the Axis twin wave. 148x43. It has a tucked rail. That helps with carving.
http://www.axiskiteboarding.com/product/twinwave/#.VD4zx2ccSAg The axis tucked rail is real difficult to do at home. So I used a similar method to the carved boards 3d carved rail.
www.carved.de/products/imperatorVse/carbon Shinn speedball is also worth looking at. Its quite short and wide 132ish x48ish. Its a nice concept and definitely a super fun board for small slop for jump and slash style of riding. But it gets over powered quickly and also because of its short length its a pretty nervous board. I wouldn't want to take this thing into big waves. It would be scary.
www.shinnworld.com/#!speedball/c1rvt Ocean rodeo Mako series is the undisputed ruler of production mutants. These boards are supreme carving weapons. But they are also very stiff, mostly because of the huge concave. They slide through chop but can be slappy and harsh in some instances. I've ridden the 140 and king. In my opinion the kite is too big. It carves beautifully but is just too much board underfoot for standard TT style antics.
The 140 is and awesome wave tt for small slop and small waves. It its too urgent for larger waves. I haven't ridden the 150 but all my research points to the fact that the 150 is the best size in the mako range.
Mako's a quite narrow boards for there size. My call they are a bit too narrow by todays standards.
King = 165x44
150 = 150x40
140 = 140x40
www.oceanrodeo.com/products/mako Franz Olry is one of the pioneers of TT wave style with his alkita brand.
Take inspiration from his designs.
www.alkita.fr/?page_id=355 My board is a combination of ideas from all of these boards plus a few more with my style added in for good measure.
Its 145x45, has radiused rails like the carved boards,
Rocker is quite high on my board 55mm plus I have a micro kick on the front taking the noser rocker to 80mm.
I've settled on the quad set up giving the best carvability while still being able to hold huge power.
You will notice that all these boards have longer length than standard TT's. Wave shaped boards are all ellipse style shapes as apposed to rectangular compared to a standard TT. My 145x45 board has a similar surface area to a 134x43 rectangular TT. Surface area is a major factor in light wind performance. If you build a wave TT the same size as a normal TT it will be wowfully power hungry compared to the equivalent normal TT.
Any way ponder these designs and start formulating ideas on what you want.
Then copy my board because its the best!... hahaha..Not its not!. But it is fantastic for my conditions. I built mine to tackle well double head plus monsters. And it owns the monster swell I get here. But its a tad power hungry for riding small slop. You don't need mega rocker for smaller surf.