Help with dimensions for Simster Tri

It's been 20 years since I shaped a board. Been inspired by everyone here to finally pick up the planer. First project: Simster Tri. I've only seen pictures of it never touched one. I'm 5'6 145 lbs experianced surfer. Looking at building a 5'6. Any suggestions on width, nose width, tail width(1 ft up and tips of the tail), thickness, bottom contours, rocker, blank choice, etc. Any suggestions to steer me in the right direction would be appreciated.

Mahalo

look here   http://joebsurfshapes.com/

and here

http://www.theswiftmovement.com/Catalogs/Hydrodynamica_Test_Pilots_2010_Brochue.pdf