I think you are crazy. There are all sorts of things that "can" be done that should never be done.

On the other hand, you might end up with the Frankenbike of the Year award.

BTW- you can just use a bunch of spacers for the rear.

I would not attempt such a bike--- it would be easier starting from a better frameset (or frame). I don't know about a 94 stumpjumper, but most mtnbikes have very different headtubes than roadbikes. Assuming it is threaded, I doubt your road fork will be compatible (threadwise)--- unless you plan to cut new threads.