Funnily enough Barry, I wasn't expecting anything this soon, but it appears the cabinet has already been started. I contacted him last week to mention another minor issue we had, and mentioned the increase in size of the cabinet at the same time. He came back saying he had already started but the change wouldn't be a problem. I haven't got an eta yet though, and as the other issue is trivial, and probably caused by the excessive heat we've had recently, it won't be high on his list of priorities.
It would be nice, once it's built, to find someone who could test and analyse both the speaker (driver) and the assembly - and has the time to do it. Just to get an idea of what I'm starting with and where improvements could be made.
You mentioned Walpurgis (flashbacks of Procol Harum there!) in an earlier post. Is this the sort of thing he (presumably not she) could do? I did approach Matt at Haycross Audio, but he is trying to focus on building speakers and wasn't very keen.

A quick p.s. Have there been issues with the forum recently. This is the first time I've been able to get on for a couple of days.

Phil