Time to order more aluminum sheet.
In the meantime, back to the cosmetic pieces. The fairing is pretty trashed, but staying with my mantra of "use what ya got" for this phase, it had to be sanded and painted. The sanding was complicated by several sloppy repairs of cracks with some nylon material that didn't bond well to the ABS.
The upper fairing turned out pretty decent, so I may even keep it.