Low cost flux / MIG welders finally brought quality welding to the masses in my opinion.
I can't come anywhere near the creativity and results you have. I've only built a couple chopper bicycles and the cart in my other thread.
One chopper is from an old mountain bike and a piece of exhaust tubing


The other out of misc pieces including exhaust pipe and some swing set pipe


And then the cart out of an old mower and some tubing. I used a borrowed tube bender though..

Otherwise it's just normal sheet metal replacement on my 69 Stang.
Looking at your stuff makes me want to go cut something else up though...

-Stephen