There's a caveat that should be taken into consideration with any of the BTO sheets floating around the web.
Not all options work with every other option listed.
For instance, you can get fiber or colored (blue, green or red) purfling with some bindings, but not with others. There's no way to know that when simply filling out the worksheet, though. When the information's entered into the BTO software program at Taylor, the conflicts become evident.
Just because you can dream it up doesn't mean they're gonna' build it. They just won't do certain things. That said, it's still the best "custom" program in the industry...