Was trying to figure out how to add some pounds (fairly easily) instead of making a new bottom plate , as joe suggested, I am trying to locate heavy parts, pump, batteries,ect,, towards back. I did decide to add a 1/2" piece of alum stock to the counterweight. And I also relocated it back a bit more , just a touch past 1/2". It also gives more scale 12'4" swing of the 1:1 cat 349.
I didn't strip paint off these side pieces yet, but will.
Milled the sides flush and just filed the radius by hand.