There's a lot to the geometry of a front end. If you take a look at someone like Heidts web site they have some good simple explanations.
http://www.heidts.com/pdf/Understanding_IFS.pdf
It's certainly not just getting something that will bolt on and work the whole thing has to work together and be safely welded, fixtured up, engineered etc etc etc. That seems like a few bucks to buy but for a one off and doing it yourself you'd get all that into it. I've made a few different parts for suspension and steering but trust my engineering, welding and machining background. I've drawn up components in CAD but would like to see the parts in a 3D program. If you do decide to go ahead I'd recommend finding a tubular hi po geometry you can copy close to your track width, wheel offset, brake size that will fit in the wheel etc.