There was a very cheap workbench in the hardware store.
It had been reduced in price twice already.
I thought about getting it and modifying it to fit into my car.
Removable with foldable legs.
a) it didn't quite fit and
b) I decided that to be used just once every two years on the Chaos Computer Club - Camps this wouldn't warrant the effort.
No matter how much fun it would have been to build this.