If you are looking for a small tri then how about this one.
It is designed so a person can sit constantly in a central seat. is 3m too small? it is from kendrick designs.

http://www.kendrickdesign.com.au/3_metre_tri.htm

although have a look at the other designs on the page. there is the scarab 6.7 which costs about Aussie $13000 to build and uses a rig off a hobie 18 (or tornado if you're game)