Walter,
I went with a cored fiberglass top. Originally I was thinking of sticking with canvas or doing a thinner top to keep the cost and weight down, but I really liked the look of the fiberglass tops done this way. Since it's foam cored it's not that heavy, I was told 2.5 lbs per square foot and about 60 lbs for the frame. My old canvas was about 8x10 so that works out to about 260 lbs total (probably a little more since I think the top is a little longer than the canvas was). While weight up top isn't good, compared to the 30,000 lbs+ that the boat weighs, much of that very low in the boat (the engines are 7000 lbs combined) I figured it can handle the weight. Many of these boats came with full tuna towers and I spoke to the dealer I bought it from, who was a Blackfin dealer for years, and he said I won't even notice the difference. It's a very stable boat so even if it rolls a little more I figure I'll be fine.
The work was done at J&J marine in Somerset Massachusetts.
http://www.jj-marine.com/index.html I did a lot of research and there's not a whole lot of places that specialize in that work. I looked at a couple possibilities in NJ also but decided to go with J&J based on their reputation and the fact that they do everything and I was only dealing with one company - they have their own yard, their own canvas shop, etc. They build the hardtops for new Cabos in the area, and also some of the smaller Hunt and Hinckley models so they have a lot of experience with this type of work. I'm really happy with the work they did. Jeff, the owner, really has an eye for how to design the tops to fit the boat right.
I ran the boat there in November and they moved it into a heated shed and did all the work over the winter. The forward sections of the enclosure are 'Clear Vision' which is very similar to EZ2CY. The back and sides (past the first seam) are strataglass. He didn't recommend going all the way around with the clear vision because of the way it opens and it requires bigger borders.
I'll send you a PM or email with some of the cost details when I get a chance. I had some work done that was separate from the top also. I've had the boat 7 years already and am very happy with it and if all goes well plan to keep it at least another 10. It wasn't cheap, but given that I decided it was worth it. The old canvas was shot, by the end of last season I had it held together with duct tape so I couldn't put it off any longer. I decided at some point if I was going to do something I'd go all the way and get it done exactly like I wanted even though I spent a bit more than originally planned.
John