what a bargain!
and that brown cars sweet
method mentioned above is how i believe it's done aswell. me and a mate did that to a metro while at college
i found some pics a while ago of daggies car when it was being built (sorta talk for themselves).
you doing it yourself or getting someone else to do it?
Two key things to consider (there's probably more things but this is what i'd worry about most)
1) be carefull when welding as too much heat can cause the panel to warp
2) try to weld the plate as close to flush as possible to keep filler to a minimum
hope that come in handy