1. It will get you pinged to any article that strikes my fancy.
2. The wagon wheel, two ways, a) There are removable supports, either snapped off after the print is done, or washed away in a suitable solvent, often nothing more than water. b) You could print the wheel in two horizontal halves, and glue, melt, snap or pin them together after printing.
Excellent suggestion. They could also be riveted or fastened using sheet metal screws or nut and bolt fasteners. I pop-rivet the stronger plastics, like nylon, PETG, and sometimes ABS often. Just use a backing washer to prevent pull-though.