Adrian,Thanks for clarifyng the cabinet dimensions issue. Now that I've managed to download the pdf of the 4430 studio monitor, I can see that changing dimensions will be less of an issue than I thought. The 4430 is 35.75" H x 21.875" W x 15.75" deep, almost identical dimensions to my Tannoy DMT 15 II monitors. I may have to make the cabs a bit taller to fit everything on the front baffle (ports, woofer, 2380A horn), but haven't done exactly measurements yet. Another option, suggested by one friend, is to mount the horn on top of, not inside the cabinet. This will make vertically aligning the driver voice coils simple. Decisions, decisions. . .
As you pointed out, thte 4430 cabinet is a adequate model for a bass cabinet, but with the different HF driver and horn that I'm using, no more than that.
Will try to work out complete cabinet plans next week. . .
Best regards,
Joel.