Sean,
Here's a link to one of Bob's creations. You can write him, and he will send photos with an explanation of the process. I don't think he has a web site, but I'm not certain about that.
I use his crossovers on my La Scala's, and they sound tonally like the originals, but the mids/highs project notably better.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=14993&item=5753603889&rd=1&ssPageName=WDVW
Howard