Brian,
For your information, I have built the BOSOZ already and I'm very happy with it. I spent 80% of the time building the chassis because I don't have the right tools and that's why I decided to invest a little bit on the tools for building the Aleph 2 and possibly many other projects in the future. When I said building the chassis, I actually meant modifying a case that I bought from swap meet - took out all the internal parts, drill holes and so on.
As for the BOSOZ itself, I have asked a couple times (including you) about getting a 4 gang 10K pot for the volume control (at a reasonable price) but so far no luck. I'm currently using two 2 gang pot for the left and right volume control. I have built it with balanced input and output.
Then the subject came up about building a Aleph P - it's probably you or Dale that brought it up. I want to let you know that I would be interested to join again for another bulk order.