I contacted PrimeTime and asked if I could order a cabinet from them. This was their reply: If it is one we are currently using. We do not do any customizing. Secondly, we cannot sell directly to retail customers (due to dealer agreements), but you may order through any of our dealers. They set their own pricing, so to find out the price, you would have to inquire of the dealer. Finally, keep in mind there are no "backers" inside the bathroom wall to support a cabinet. Your installer would have to determine how to support it.
I'm a little concerned about the "backers" he mentioned. Do you think I can easily remove a panel and add that?