Interesting things have happened. Apparently, the Loctite 242 that I used to cinch the upper fender bolt leaked out and attacked the front fender - which explains why the fender kept rubbing the tire.
I've since filled the entire broken area, slot, and rear hole with Milliput, and lined the bottom with a sliver of an aluminum can just to be on the safe side. I'll find out tomorrow if the end result will have the strength to stay together, get another hole drilled through it, and not crack again.
This is a pretty lousy photo (and doesn't show what I'm about to describe), but upon installing the new Mini-V brakes, I found that the V-brake cable binder bolt interferes with the brake stiffener. Yet another order to McMaster Carr for stainless spacers should solve that.
Paul Duplex lever is also on order too.
-Kurt