Good idea.I can't help but compare it to 2 halves of a gemsbok horn connected to a wood handled filler.Not near the mass though in the limbs to slow it down.It's a balancing act with a shorter draw on yours.
Good point about grooving that boo and horn too by Chuck.Although I've seen FG recurved tips stepped on to be flat by an FG bow maker to prove the strength of smooth-on and no delamination occured.
Well if it is'nt enough poundage weight a guy could still put a 1/4" thick sinew over it yet,but that will pull that sucker into more reflex yet!Assuming it holds together,which I think it might.
I think string angle would be better farther apart feel wise on a regular bow but this is a locked in cross bow.Closer together would put more strain on the limbs.Making best use of horn.It's your call.When the limbs are that short I'm not sure it'll make any difference in speed.