ORIGINAL: kwilson16
I admire your desire for self sufficiency but...
With the current price of steel, it is impossible to make something for less than you can buy it.
Here's an acceptablealuminum hang-on for less than $40. It will be lighter, safer and more proven:
http://shop.sportsmansguide.com/net/cb/cb.aspx?a=450120
I agree, unless you have the material laying around and you want the satisfaction of building your own, you can't build one cheaper than you can buy one.