I have a single speed mountain bike that i buit up a few months back. in its current state its ridable, but not finished. Its an 80's trek steel frame, with a mixed matched (but really pretty nice) wheel set, and a road master POS fork. Ive been looking into fork options for a while, at first i wanted a suspension fork but its one inch threaded blah blah blah. anyway, point is, I've settled on getting an old 26" bmx fork. They're cheap and strong. however, both of my wheels have disc hubs on them, right now I'm using a cantilever brake on the back and there is no brake on the front. I was wondering if it is possible to weld disc brake tabs on the front fork. If so, is it safe? if not, would it be a wiser option to weld tabs on the rear end?

this is what I'm thinking in my head:
http://www.ebay.com/itm/Landrace-CR-...ht_1398wt_1114