I did check the CZ posting and that lead me to this:
http://www.marschalgrips.com/?content=CZ_SP01-models
It seems the way to make weight is to use light grips and 10 round mags with the plastic base. Unfortunately, the only way to know before I throw a hundred bucks at it is to do some calculations on the current weight, the current weight of the grips and the mags and to see if I can find any specs for the 10 round mags to compare to. I don't think this is going to happen this weekend, but if I get it done, I'll repost. If anyone has done this, let us know what it gets the weight down to.