After reading this, I dug out my old RAM 750 air start manual. The installed weight of just the engine was 2.2 lbs. The manual has no other weights listed for the peripherals.
My first one was S/N 42.
I would recommend getting a double wall pipe. BVM could make one, or you could get on from Tam.
You can purchase a Smooth Stop II upgrade piston from BVM. It's worth the money.
When you look inside, some of the "cow urine" you are seeing is really Kevlar clioth. It's yellow in color.
The resin yellowing is caused by UV light exposure, and time. Some resins contain a UV stabilizing agent, but it's effect is minimal.