Thanks for the info, I will be interested in hearing how you like your Tannoys once the cabinets are completed. My existing cabinets are approx. 22" x 22" 16" (outside measurements) and look like these:
Building new cabinets myself is not really feasible for me, but I would be willing to have some modifications done if I thought the improvement would be worth it. Perhaps raising them up and making the grilles removable would be worthwhile.