start with an old microwave. Some people toss it out as is. Some like myself, take it apart to save different pieces. I save the turntable. i use it to mix auto-body filler on. I save the 2 magnets. they usually end up on the refrig unless the kids steal them. finally the discharge capacitor is...
a cover for the utility trailer coupler and lock from an empty plastic dishwasher pod container and a cover for the chain lock on the trailer from a piece of old tractor tube.
go to your local scrap metal place especially if they handle stainless. Often you can find some sort of ss tray that has been scraped. I have gotten several this way.
nice job. I have owned 8 XJ's. Yes rust is a problem. I have worked on rust several times. Driver and passenger front floors had big holes. I weld in pieces of stainless. I would suggest using stainless on your build, otherwise there is the possibility of rust down the road. also using stainless...