This project is now a year old. Originally, he was to be part of a trio of superheroes naked, and by naked I simply meant that this is what's always under their clothes.
I was also planning to enlarge their members with papier maché or foam insulation. At one point, Superman was to have a silver bullet, but I thought it would be too jarring and silly to see that silver on top of red skivvies. So I've finally decided to shape it like a bullet and have a little bit of silver coming through.
(Spiderman would, similarly, have a spider-shaped one; Batman, a bat-shaped one.)
Once the glass is finished, the hollow back of this torso will be filled with foam insulation, and he will be attached with silicone to a large board. The board will be filled with quarter-inch-square pieces of red glass where his cape is; the rest of the board will be some variegated background.
The border will feature words, a mix of scrabble letter and necklace beads and type under glass, that will contain the introduction to the old Superman animated shows. "Faster than a speeding bullet. More powerful than a locomotive." Etc. Of course, in those old movies, the introduction changed each time. Sometimes it was, "More powerful than a hurricane."
But time has gone by. Right now Superman's Penis is no more than a blog hit on Google.