Jakob,
The step by step is here...
http://www.mikenchell.com
and then click on the webcam archive
I used ping pong table plywood for the sides of the Baja Benroy... it's 5x10x3/4 and the glue they used is exterior glue... It's nice and flat, but it's as heavy as can be...
Depending on your tow vehicle, you may want to consider 2 sheets of baltic birch plywood... those are 5' x 5' btw... so you'll only have 1 joint...
How did I do the 6' wide roof? easy... I took a 4x8' sheet and cut off 2', and wrapped it around the curve...
Mike...
The quality is remembered long after the price is forgotten, so build your teardrop with the best materials...