I think the stiffest spine you can get will come from a 2117 shaft, I think. So, no there aren't any aluminums that would handle that length or weight. As far as materials used? That's up to you and not everybody else. I know a few guys who shoot carbon from self bows, that's fine by me if they shoot well and hit what they aim for. After all, that's what we all want in the end. I may shoot carbons from a self bow when I hunt mule deer in Wyoming next year, who knows.