Giant slab of camphor. About 8' long, 23" - 36" wide and nearly 4" thick.
Sanded to 1000 grit, the bench has four coats of Danish Oil and two coats of wipe on poly. The latter was water based, and was not worth the time or money I put into it.
The whole project took about three weeks from start to finish.
I marked this project intermediate because I had to buy and use a belt sander and that may not be in everyone's took box.
Wipe on poly
Lots and lots of flattening and sanding