The first Tiger Top I had went up and over the rear sockets. I can't see that in any of the advertisements of the current tops. I would strongly consider altering my top before cutting my sockets.
Here's an example of the cutout notch on Allen Hinkle's 3B at the SE Get-Together (my guess is this top is somewhat recent):
https://cj3b.info/Events/SEWillys2017.htmlSo, maybe a call to the company to ask directly would answer that. Snaps are used all the way around. The only good thing about the newer tops is the snaps are hidden under the outer layer and don't show - but the snaps will show along the tub when the top is off. A full set of bows/hardware comes with each top, even if you're replacing one. Too bad there isn't an option of fabric replacement only.
I had an earlier version (all the snaps showed). I parked mine outside for 9 years and the vinyl held up okay - the windows did not. I really didn't do anything to help this at all (I washed the top once). It spent another 10 yrs under a tarp with no further wear/decay. I don't know if the modern version vinyl will last longer or shorter than mine - but you can see some examples where care was given and older tops are wearing very well.
From what I've read on the canvas tops is there will be shrinkage, so it should be a bit loose at first. I think there may be some needed treatment to help with waterproofing, I'm not sure. There are some choices of where to get one but waiting can be very long in some cases. Also, while their patterns are most likely accurate, I'd want to get a couple of trial fits during the making to be sure things line up. Having a full set of original style bows/rods will be necessary too.
See Bob Christy's new canvas top as well as some other nice examples:
https://cj3b.info/SoftTopHistory3.htmlMy dream sheet would be a hybrid between the two styles.