Hi John,
I've been away, hence the slow response regarding quality woodworker in SF. His name is Thomas Reed and his number is 530-277-3975. He build a dining table for me that has a beautiful hand shaped bevel on it almost exactly like the upper baffle used by Jonathan Noble's basszilla seen at tip#72 on Olsher's site.
About the Hammer Super 12s, they are an extremely good value. I think that Olsher's review was pretty spot on. Mine are stock with no mods yet. I built them of MDF and would not repeat that with other speakers in the future. One fault they have is that there is a slight boxy quality to their sound. Perhaps a bracing issue or perhaps due to their mdf. Next time I'll use Baltic ply 1". Anyhow, I have experimented with removing their backs and find the sound just lovely running them as open baffles. I was surprised that it didn't screw up the sound. Lost a bit of bass, but they really opened up and became seamless in their presentation, very invisible box quality, just music. Presentation (almost like wearing headphones, very involving in a non-fatiguing way) is what I like about the Hammers. I owned Spica TC-50s before this and found the Hammers to be the perfect next step up. I have compared in my own system and space a pair of very expensive Merlin speakers and I prefered the Hammers overall, though clearly the Merlins offered more detail. My room is 20' x 20' and the speakers are set on the diagonal plane. The Merlins just couldn't fill the space with enough pressurization. The Hammers totally fill the space.
In the future I would be tempted to make any box speaker with a removable back so that I could experiment with mods and O.B. mode. I'm hoping the Basszillas will do the same things the Hammer do, but better. Keep us posted.
David