I've done just what you were talking about, they are skids more than shoes.. they work very well, with the ramps on the front of the skids you can curl the bucket down a little to scrape as low as you want to go without getting gravel. I had to add some weld to the front of the ramps after the first season as they were starting to wear thin. Since then they haven't worn much, I guess the weld was better material.
Like Oldballs was saying, I had to drill 4 holes through the bucket on each side to attach them, then file the holes square to accept carriage bolts. The holes haven't caused me any problems in the off season.
The body is built from 1/4 plate, except for the crossbar on the back which is 3/8 I think. They bolt up through the reinforced section of the bucket so there's no worry about them tearing out. Let me know if you want more detailed pics.
The screen for the bucket makes a big difference for snow clearing, you can get almost twice as much with no spillage over the top. Lights still shine through the screen.
Sean