Since @mattp_evil_twin did tag I feel I can help add to this. @mattp_ also states that there will be article soon that will shed light on this, which is also true.
Every ski on the market is obviously different, but every ski that is born from a previous model is improved from said model. The A2 is not a radically different ski than the A1, it improves upon the difficulty of the A1 and makes it an easier ski, it is softer and has some differences in the bottom. The S2 improved upon the S1 and so on, I hope you can get my point. You can argue the A1 was radically different, but Dave Wingerter scrapped the monza and started fresh, kind of like what Adam and Andy are doing. AM skis is able to do what no one else really has, they have a new shape and a new process. Like @mattp_ I am not allowed to say much about the process of how it is made but is for sure a departure from the norm.
Now as to offer a custom ski, it is exteremely difficult to do outside of flex. Right now the most custom you can get is getting a ski from Goode and getting the asymmetic series with the specific bevels with a specific flex. For nearly all skiers out there, this is way more than it needed. With AM I am sure you will be able to tell Adam or Andy how you ski and they will give you the appropriate flex pattern. Shape is far to hard to change, mainly because of the engineering time that goes into getting the shape right. Time = Money.
And to correct Evil, there is really no way to model the behavior of a ski within a computer program, the ski is far to dynamic and there are countless variables to account for, we just don't have the technology, time, and money for this. The only way to test is to try it.
And to finish, every ski complements a different style. Not everyone can ski on the A2, Strada, Nano, Carbon V or even the AM 33, so that is why you have so many different options.
If I am wrong somewhere please correct me, I have had a crash course on ski design over the weekend haha.
Why is it called the 33 anyway? @horton