Analog SLRs as Cheap Full-Frame DSLR Alternatives

It's been a while since we've shared some DigitalRev tomfoolery, but the most recent question posed by Kai and his buddies is an interesting one: given how expensive "entry-level" full-frame DSLRs are, would a dirt cheap 35mm SLR be a realistic alternative? The three cameras up for debate are the Nikon F65, Canon A2e (EOS