I was just about to do the Crites thing when Sr. passed away. I live only a few hours from them. However, I am reasonably handy with soldering iron and could probably handle installing an upgraded crossover and pure copper WBT fittings shipped to me by his son with special attention paid to not getting shocked by the old caps. With proper toe-in I doubt I will Dynamat the horns though. Would do the bass basket however. At the moment am experimenting with 18lb lead bars slipped through bass ports to rest on bottom of cabinet.
A few years ago I attached to the bottom plinth a piece of cut to fit 3/4 inch plywood stapled with rubber shelf liner on one side and screwed to the bottom of the open plinth.. This immediately quelled any bass interaction with my wood floors without stunting bass. I do think the modern cabinets made of heavy MDF do a good job of quelling cabinet resonances in general though. If I experimented with "No-Rez" it would certainly not be attached with permanent glue though.