I used to have one of the old Kayline tops on one of my previous 4Runners. I didn't like the way they wanted you to mount the rails to the bed by drilling holes so I made my own brackets like Roger did. It worked great. So last year I started to put together the items needed to try and make a similar top with the clear side windows and clear rear zipper window. Putting together the right grade vinyl, the clear plastic, the zippers, snaps, rails, top bows, etc is not that inexpensive. Then you still need to get the vinyl cut and sewn together properly so it won't leak or tear. So if you don't have your own heavy duty sewing machine and the ability to sew it, I think you would still come out $400-500 into it if you have to pay an upholstery shop. At that price, might as well buy the Kayline(STC http://www.specialtytopco.com/) setup that's ready to go. If you don't want clear sides and a clear rear panel you can probably drop that price a bit but it's nice to be able to see. I never finished the project and all the parts are still sitting in my garage.