http://www.ctioa.org/reports/fr65.html
STANDARD SPECIFICATIONS for the installation of tile lined Roman Tubs
http://www.johnbridge.com/forumarchive/topic0/419-1.html
http://www.terrylove.com/wwwboard/messages/15612.html
I found the draincover described at http://www.brasstech.com/brass_detail.cfm?