I fully expect the ATSF to be the most popular but as Jonathan said it depends on the numbers and more importantly what Scott can negotiate with the builders. Scott told me there were only going to be 500 total units made. That's 125 ABBA sets. One run, that's it. I certainly want the 5th porthole and I made sure Scott was aware of it.
It seems the issue is the complexity of the molds. The builder keeps costs down by using fixed molds. While it seems to me not to be too difficult or expensive to make a single mold with the 5th porthole and make X number of shells then machine off bung used for the porthole and then make the rest. The builder will probably say otherwise.
The builders Scott uses for many of these project are not in the business of making model trains, it's only a sideline used to keep employees busy. And they by and large do it on a break-even basis. And, they are, lets say, not very good at projecting costs ahead of time. And, Scott must make up any funding shortfalls at each milestone or else the project stops and might well just end there. That is how Sunset was started by his father, picking up someone else's project that was dying on the vine because the original importer refused to make up a funding shortfall.
I really wish he would do a clinic on all this at one of the major meets. The entire Asian model train business is one sprawling Peyton Place.