Yesterday I received 5x8 trailer kit from Northern Tool, and lumber from local supplier Hunter-Bower (they have quality materials and free delivery!).
Floor and walls: 1/2" marine plywood with reinforcing spars on top edges and at door openings.
Roof: 1/8" birch plywood over 1x2 poplar spars at about 12" spacing inset into 1/2" thick plywood reinforcing along edges (detail via Capt. Bob).
Galley divider and shelf: 3/4" birch plywood.
Cabinets and shelves: 1/2" birch plywood.
Estimated weight about 750 lbs. not including furnishings and camping supplies.
Estimated cost about $2000 including purchase of door hardware, etc. from Teardrop Parts supplier(s). Quality's not cheap but it's worth it!
Today I opened the trailer boxes and started reading the instructions. Will start putting it together later today. My wife is almost as excited as I am (since I finished all her "honey dos" this summer). Good thing I have a two-and-a-half car garage: I can build indoors and still park our cars!

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Build journal:
http://www.tnttt.com/viewtopic.php?t=61303In 2016, I received a kidney transplant, finished my teardrop, and took it on the road! In 2017 I sold it and am back to car camping.
Thanks to all forum members who provided advice about my build and posted info to help me get started.