Welcome to the forum. I'm also from Philly, but we're a pretty rare breed in this area (there are a few others from around here, but I haven't met anybody in person). I'm happy to help out with some welding, riveting or sheet metal work, or to give advice while watching somebody do the nasty stuff.
You should probably be looking far away for your bus on the auction sites - Pennsylvania is a salt state and the buses are almost always badly rusted (I've never seen one that isn't but I hear they might exist). Get ready to buy a bus from the west coast or Colorado or wherever, and fly to pick it up (an experience I missed out on since I had my rusted eBay bus delivered to me.
You will want to visit Joseph Fazzio Inc. in Glassboro NJ. Lots of good stuff but mainly an enormous warehouse of scrap steel that you can use to build or repair stuff on your bus, all for $0.50 a pound.
If you go to User CP in the upper left corner, you can fill out your profile details like where you live and what kind bus you (will) have. That way people always know your info and can tailor their advice to you.