I tore the Shasta down to the frame which was in good shape with just some surface rust and started building a standie teardrop trailer. I tried to incorporate the things I liked about the Shasta - large dinette, fold up bunk, windows, lightweight; and I discarded the things I wasn't so fond of - ugly profile, not enough headroom, inside kitchen.
What I ended up with was a scaled up teardrop with 6'3" headroom, queen size dinette, fold up bunk, and another bench/bed, and a full 6-1/2' rear galley with icebox, sink, and stove. Other items I designed in were storage for my Weber Q, 16 gallon water tank, 3 x 12V batteries, gas heat (from Shasta) and AC. I also enlarged the door so I could fit through without stooping and plan to cover the entire trailer in aluminum.
My construction is similar to the Puffin in that I am using 1/4" plywood, except that I am using birch since I will be finishing the inside with clear poly. All framing for the windows and doors is maple and I am using the benches and and rear cabinets in the hatch to reinforce and brace the walls. The roof spars are 1x2's and I plan to skin them inside and out with aluminum and run wiring and insulation between similar to what Retro Traveler does: http://www.retrotraveler.com/RT1400.html.
One I get the pictures off my camera I will post the build photos, currently I am building the body off the frame in my garage (so it will fit through the door) and will mount it on the frame once it is weather tight.