well, they ASKED for a loaf of bread look! But I'm curious about your other ideas, Chris?
I think Benzine's first suggestion is what I'll try first, but I might use an actual bread loaf pan as a mold for the bottom and sides and then shape the top by putting a thin slab over my rice-stuffed panty-hose leg. I use that for supporting sides of slab built dishes, but I think I could push the slab into a nice home-baked loaf look using that as a support! Once I get around to it and get something made I'll report back.