Hi,
If I had a gyro that looked that good, I would leave it on the mantle.

Be careful when reducing the weight of the blades as you will loose stability if you get too light. I can't tell which airfoil you are using on your blades, but the SG6042 profile will provide much better lift. In tests that I have conducted, a set of 55" diameter SG6042 profile blades out performed a set of 74" diameter clark Y blades. The 55" blades turned much faster and created a much more stable gyro. Also the SG6042 blades will spin up without any shims.

Best of luck and keep it looking nice.

Phil