Lovely cap. The shellac looks cool.
As a tip before you install/ wire check your pot in the nearest hole for height so you only have to do it once and work out spacers etc.
I installed mine and didnt realise till later when i fitted knobs that they sat way off the body due to the thinness of the top.
Pulling pots out and trying to reinstall ended up with lots of broken connections, resoldering and frustration.
Theres a few different methods to install in the forums so have a look through some of the build diaries for the ES.