Since I have the Extreme subframe from SpeedTech now, I can attest to how hefty that LCA is.
One thing I spoke with both Ron and Roger at SpeedTech about that I liked from my previous JRS setup was the spherical bearings in the control arms. There is a lot of friction (Ron calls is stiction) when you go to move the arms with no spring/shock in place. I've thought about making a set of my own, it wouldn't be that hard. Aftermarket kits are available for the C5/C6 to do exactly this, but they are stupid expensive. You can get the high quality bearings for < $50 each (I did for TOW). 8 of them gets you to $400. But its the sleeves and standoffs which will take the machine time. Anyway, I digress...
Another thing about the ST LCA's: they are designed to go on a (typically) much heavier street car than I think Ron designs his race car parts for. That said, the race car has the capability of inflicting MUCH higher loads / stresses on components I would expect... So perhaps the higher forces of a racecar offset the raw weight of a street car. And thus this is certainly not a place to save a pound I think. (I'm rambling out loud here now...)
Good luck on the new plan. Like everyone else, I just want to see you out having fun with this or Yeller or whatever car you're driving!
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