By the time you cut everything, get it jigged up, figured out, test it and make sure it’s gonna work, the mail man would be walking up your driveway, crossover in hand,……welding any of this thin gauge sheet metal is just not a good idea,….and definitely not a stick welder!!…..good god, you’d never get it turned down enough to bury a rod into it to do anything,….but make it disappear,……I weld all the live long day, even a small mig machine is gonna leave you with a lot of clean up, ….to be sure there’s a hobby shop or something near by??….a crossover is one of those essentials nearly any train store would carry,…….but hey, …it’s your time …good luck, and enjoy!…
Pat