This trike is a long wheelbase, semi-recumbent, rear steering delta. I have built five delta trikes so far. This one was number three and it is still my favorite one to ride.
There are three main parts to the trike: the front power wheel (Steps 1-4), the main frame with seat (Steps 5-6), the rear steering wheels (Steps 7-11), rigging (12) and the optional cargo rack (13). The trike is built from parts from three donor bikes I got at a bike coop as I described in this "Ible": http://www.instructables.com/id/How-I-Get-Free-Bike-Parts-Legally/
A parts list is on its way (14).
Welding is required and the cost for purchased parts was roughly $100.
Front wheel 24"
Rear wheels 20"
Width of track 31"
Length overall 78"