Seadek has a kit. Mylar sheets, marking pen, tube to send them back. Lay out the sheets, mark the edges and location of cutouts and send them back. They'll make a template and send you a file that shows the dimensions. I highly recommend that you spend a couple extra bucks and have them use that file to create mylar replicas you can check on your boat. When you think those fit right, give them the green light and they'll cut the material.
I started from scratch with my first boat (Farallon) and tried something different for the second. Seadek has a number of boat kits already patterned, but there aren't any Parkers on there. I asked them for a file on a 2320 close to my model year that they had already done - they gave it to me and I modified it for my boat. I'll skip the details, but if I had it to do all over again I would have started with the blank sheets.
Had the same sticker shock, primary reason I did it myself. I'm sure a professional installer would have done a better job but the one my wife and I did is good enough...and a lot less expensive.
