But of course, I'm not a skilled craftsmen and I used what I had laying around. Hence this:
Yes, that is pine 2X4. Yes, those are tire inner tubes and nails.
Things I learned:
1. Use light weight material. Pine is not light weight. At all. It isn't strong, it isn't light weight, it doesn't even have a nice texture. Don't use 2X4's.
2. Place your toe holes very carefully. I put the left foot hole to close to the edge and my big toe is forced off the sandal.
Honestly that's it. Except for this:
3. Bicycle tire inner tube make excellent straps for sandals. Really.