Jim, correct me if I'm wrong. But aren't Top/Down and Bottom/Up cross stringing dependent on where the mains center, Head or Throat?
For example if the Throat has 4 pairs, the ends of the mains will finish at the top. If it were 3 or Odd pairs, they would finish at the bottom. This is assuming that the patterns are 16 mains, which a majority of racquets are.
For 1 piece stringing no it is not dependent on what you said, its more manufacturer dependent rather than what you said. Say if it is a Head racquet, and the mains end at the throat,
you still do not want to string bottom up, as that is not allowed by Head,(or others like Yonex, and Prince),as that can break the racquet if strung bottom up, so if you still want a one piece , you need to do an ATW, if you desire, or string them as a 2 piece, which is what I normally do. As matter of fact, I string
almost everything 2 piece, and string them all top down, as even though some manufactures say it's okay bottom up,(like the Gamma racquet that the OP posted here), I still string top down.Every so often I will string an ATW just to keep up my memory on the different ones I do, but they are all top down stringing, as thats the reason for ATW .
The paragraph below, is from August 2008 issue of RSI magazine, that is sent to USRSA members, and I'm sure that you will find this interesting, as this is another reason I string all Head racquets 2 piece(besides all the hybrids I string for people, I find it seldom to string as a 1 piece).I very seldom even have anyone to request either 1 or 2 piece for stringing as well. So I string most as 2 piece,(top down), tie a good cinched up knot, (and I up the tie offs tension 10%, just like a lot of tour stringers now do), and there is no problems.
Anyways here's the article:2008 RSI mag.
"HEAD requires that every performance racquet they sell must be strung two-piece, period. With a properly-done two-piece string job, you avoid not only having the crosses installed from the throat to the head, but also any potential problem that might occur with an around-the-world or box pattern, where you might have a 90- or 270-degree turn between a main and a cross, which could break through a section of the frame where the grommets are close together. Because of this, in the unlikely event there was a problem with this frame, Head would have the option of denying the warranty claim due to the one-piece string job."