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I appreciate the feedback. I'm going to order the top on Monday so I'm glad I'm getting my questions answered.

"The absolutley critical location for the aft end of the track is where the slilding leg must be for proper deployment of the top. On mine, the slide has a snap web that snaps onto the aft track end cap, to keep the leg from sliding forward. This MUST be snapped or the top will collapse, with the leg slilding forward. Does that make sense?
I'm not sure I'm understanding what you mean by a Snap Web. Is that just a strap that holds the bottom end of the sliding leg at the aft end of the track? Could that be done with a 1"wide nylon strap that snaps back to itself and is just long enough to hold the leg from sliding?

The front dimension is the length where the sliding leg must be for storage of the booted top. Here it also has a web strap that snaps into the forward track end cap. This keeps the booted top from working backward while underway or in rough conditions. I planned on installing a 1" wide nylon strap up near the bow that would go around the folded top and snap back to itself to hold the folded top in place. Does that make sense? Now I suppose the track could be a little longer, which means the slide cannot be locked in place, and in lieu of that, a bunge cord could hold the top both forward and hold it down. But why have unneeded forward track length screwed onto the top of your gunewales? the top can only go so far forward or it would fall off the bow. My plan was to install the aft end of the slide so the leg would be in the correct position when the top was up. Then fold the top down, move it forward to where it would lie on bow and measure where the slide is in the track. I could then cut the track to the proper length and affix the front end of it. My point was that the tracks suppied by Mills in my case were exact, for purposes as described. My other point was to be sure your track is at least long enough to allow the top to slide as far forward as you need.
No problem with having the track long enough for the folded top to lie on the bow. I looked at the pics on the Mills Canvas site and noted it doesn't look like they used slides at all. At least they're not easy to see in the photos they show.

http://www.millscanvas.com/cfm/pictures/images/Suntop%20002.jpg