lighter piston query

All opinions welcome. I am thinking of making a new piston for testing in my "industry sp2" .22 pistol my line of thinking is a lighter piston might accelerate faster and work smoother than the crude cast iron one that comes stock. I am also thinking that this would reduce the kick/bounce/??? of the springer action.

So a few questions: I have a small taig lathe and a taig CNC milling machine and a supply of T6061 aluminum stock & some 12L14 free machining steel. The 12L14 steel can not be hardened but should stand up to the trigger sear for a while and I can always make another replacement part later or make several on the first round.

Probably going to stick to the stock leather seals, I suppose I could find a 1" seal for a brake cylinder and use that but it's probably not worth it in an imperfect cylinder.

Will make the new cylinder walls thicker so there is room for counter bored socket head cap screws to secure the trigger sear part and just a bit of clearance above the spring diameter.

I could probably make an entire new breach out of aluminum but then would have to redesign the entire thing, trigger etc

So your thoughts on this?

Hey it's a hobby so cost is not the object here I know if I add up my time/machines/design I am taking a $20 pistol into several hundred dollar range but I am having fun (just wish it was fun plinking rather than thinking about this)

Kristin