I did advise Andrew of this by PM. Sadly I couldn't collect themWaaaaay too cheap!
I also have Berkeleys and was wondering the same thing. Although I believe my drivers are the HPD 385A variant and also my cabinets have had some serious reinforcement at some point in their past.Interesting. I've got the same drivers in my Berkeleys, I wonder how the sound compares from my conventionally ported boxes to those GRF style cabinets?
If you don't mind my asking Andrew, how much did those enclosures set you back, I may have to look into getting or making a pair?