Mark,
The Scanspeak is this one
http://www.wilmslow-audio.co.uk/scan...1g00-682-p.asp
At the moment all I've done is come up with a design that is aesthetically pleasing (at least to me) Although I fully accept that it is not a design you would choose. But I'n not a great fan of box style speakers, however good they sound. But if there is some change I can make to the internal chamber that would work better with the Scanspeak then I'd happy to make some adjustments. The thickness of the external walls will be 25mm and the gap down the column will be about 50mm deep by 200mm wide. In part that was done for practical considerations to allow the cables to go from the drivers to the crossovers in the base.
You might have learnt from some of my previous posts that I am completely non technical. So I have treated this project like all the other stuff I've designed (furnitiure) to look good and not much else comes into it. But if you can offer any advice that I would understand and stays within my parameters of what looks good I would be very grateful.
I've done a quick VAS calculation to see if needs porting and it falls into could be either camp (70). Given that I'm not into heavy bass I'm inclined to keep it as a sealed box anyway.