As for the top.
I think you could use the top, but you would have to completely change most of the hardware. I have a better suggestion, though.
If you cant see through the windows, they make a plastic window polish. I have it and have used it. By hand, it can help drastically bad windows become at least visible. What I suggest, though, is to buy this thing called the Powerball by Mothers (just a big red ball). All you do is attached it to the end of a drill and u apply the polish to the windows and the powerball and go to town on the windows. This could solve your window problem. If the rest of the top is shitty too, the new top idea would work better then. The powerball usually runs $20, the polish around $6 (I suggest the Mequiars polish.)
Hopefully this helps with that dilemma.