The different riser shape really doesn't have anything to do with the G10, just a few changes I've been evolving. Less deflect for one for a longer power stroke, longer shelf to give a little more protection from fletching contact on the hand, shelf is still right on top of the hand just an extended shelf. And then the ends of the riser have a bit different shape/angle. Been making a few minor mods but I think this one is pretty well what I want.
I'll post some pics of my forms. May still make some minor changes to the limbs. They're not hard to build as long as you use the right material to stabilize them torsionally which I plan to change up a little to be able to extend the recurve while retaining sufficient stability.