Warmonger: I believe the welding solution to be the easiest. Either that, or locate some brackets at a scrapyard. Your SVT is an E1? It should be relatively easy to find brackets for the brakes, either from a scrapped E1, or from a V6 Cougar.
If you are so inclined to do the welding however, as long the guides are ground down smoothly and are parallel to allow for proper pad travel, I don't see a problem with it. (BTW, this is the route I would take, if it were my car)
Not to belittle your knowledge, but you did remove all rust/corrosion/debris from the hub prior to mounting the new rotors? If not, the rotor will seat incorrectly and it won't be true.
Sometimes a small oversight such as this can cause the biggest problems. Just trying cover all the angles...
