Goopster,
I always attempt to drill out the spot welds first, then I use either an angle grinder or a dremel if I can't get the grinder in. A file is always on hand as well for the awkwards little corners.
Somethings I'll cut a hole in another panel thats to be replaced just to gain access but you need to carefully work out the order that you'll put it back together so that you can get the welder or grinder in
Thanks Ratty, that's a big help. The quality of your work is superb. I'll definately be following your advice and watching this thread with great interest. Top job, keep it up!