I did Seaglaze window, $$$$$$ but what a nice product. They make a beautiful frame and rubber trim. Plus the inside cleats are also made of very high quality material. There finishes can be anodized, power coated or painted on request. And lastly they will make your windows and hatches in just about any radius. I am sure if the hatches are like the windows you will be water tight. I have never taken a drop of water on my side sliders of fix front windows. I highly recommend their product.
tunalvr, Are you thinking of installing the hatch on the trunk cabin roof? Most of those have a radius...Best install would be to mold a bezel on the roof top so the hatch installed will bed nice and flat and level. From what i know, the leaking issues occur when installing a flat hatch on a curved rooftop - not so much due to any one manufacturer. Just something to consider from someone who had a leaker and spent alot of time fixing it AND i hate leaking windows and hatches more that anything!!!!!! I also vote for DSG products..... awesome. I have their windows on my boat, not a drop of water comes in. My hatch is a Bomar, but my leaking issue was due to the installation..... Also key to use the proper bedding caulking.
Thanks for all the info. I decided to scrap the idea of a hatch on the roof. Don't want to deal with a leaky hatch. Guaranteed not to leak if theres no hatch. But I will go with the DSG windows and doors.