I am one of those DIY guys, so far i built number of coaxial rests, many more stocks both Br and tactical and am actually just finishing 4 types of actions (and 2 triggers) from .22lr to .408CT , but as i am from Europe info on rails is hard to come by , i see Young and many others base their rail tops on an I beam construction which is probably simpler and cheaper way to go . But i am going for a Rail machined from aluminum billet. I did get some head start from my friend Speedy that helped me out with details on his X wing railgun.
My rail will serve to play and test stuff so i could really build a much simpler rig, but i would really like to build a full on race railgun and then play with top 'accesories'