I've seen these bits for sale and thought it would be easyer than welding/filling. and would look loads better

Today i'm pulling the guts out the inside of the van so i can see the damage from both sides (and the guts are cr#p

How do you seal the panels together?
Also who's doing the best price for panels? I've see a bloke in derbyshire who's name i don't remember, i can drive there after work in less than 40 mins
