I added the DIY Pro Swoop Tower to my old Four Winns 180 Horizon and couldn't have been happier with it! All the materials were very well made and it was extremely stable. At 6'3" and 210 lbs, I was able to do chin ups from it and wakeboard behind it (w2w 180s, w2w 360s, grabs, and face plants). I also installed the DIY speaker cans and board racks. It took me and a couple buddies the better part of a day to get it all installed, but it turned out great! Also, Raul from DIY was great to work with; he even answered numerous calls on Saturday while we were installing it. Here are a couple pics.
Let me know if you have any other questions.