He might be able to pull it off. Still, I`d probably go with steel if it were me because you may need to change something later- especially since there isn`t as much info on tadpole geometry as there is for DF. I wouldn`t want to play "lets try it like this now" with aluminum. Or I could just be paranoid. In the interest of full disclosure, I`m not a frame builder either- I just like reading about the process and since the smart guys seem to be leaving this one alone I figured I might as well offer my gibberish.