Hi Folks,
For demonstration purposes, I listed the template in the eBay sandbox for viewing in the New IFRAME Design (also called Split Domain).
http://cgi.sandbox.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110035361648
For this demo, I set the upper and lower main tables to operate at exactly 928 pixel width. This achieves absolute dead center on the New Design page for 1024x768 or higher monitor viewing. The upper and lower portions of the page operate at 940px width and the IFRAME is indented 3px from left margin. Due to lack of CELLPADDING OR CELLSPACING on the IFRAME undimensioned table, there is an unfortunate further indent of 3px that surrounds the template. Therefore, 928px causes the IFRAME to operate at 934px with a resulting 6px margin to left side of the template. Whether eBay will correct this oversight after beta of the New Design is unknown.
For those interested in a full discussion of custom template redesign in the IFRAME, I've just completed 7 days of testing in the Sandbox and will try to start a Forum thread in the next few days to discuss results and options.
Danno