GO to Eastwood Co. web site, they have all the do it yourself stuff you’ll need. For the floors make cardboard patches then transfer to metal. Use Eastwood’s flanging tool either pneumatic or manual, then use Eastwood or 3m panel adhesive to glue things together. On the internet, 3m has a video showing that a joint with their adhesive is stronger than a welded joint. Many panels on OEM cars are now bonded with panel adhesive instead of welding. Welding unfortunately burns off the anti-corrosion coating on the inside of blind panels, and will promote rust through from the inside. (eg. my daughter’s Grand Prix with a Mr Goodwrench repaired, seamed quarter panel three years ago) About the only things that should get welded are those that involve structure or where factory welds have failed. The heavier gauge metal parts.