There are a couple of possibilities.
A dealer may have come out to Taylor University and built some BTO's during that. It's not uncommon for a dealer to look at Bob or Chris Wellons and say "But can we do this?", and Bob or Chris look at him and say "Sure, we can do that."
Another possibility has to do with the strength of a dealer. There were certain dealers I had who I would bend over backwards to help. If I had a dealer, who was doing $350K a year in business, and he wanted an Ovangkol overlay on the peghead, guess what? I'm going to the mats for him to get him that Ovangkol peghead overlay. Conversely, the guy doing $18K a year in business gets to choose from what's on the BTO sheet. Period.
You scratch my back, I'll scratch yours...