Generally, additional weight from a hardtop versus a soft top enclosure is NOT an issue unless a boat is already unstable;just don't make the hard top out of concrete!! I made my own hardtop and posted ad nauseum details here..Quite a few here said laminated plywood and fiberglass over would be a weight concern...it was not...I epoxied two 3/16" layers of plywood together bent to my old soft enclosure fram shape....and then dynel fabric and fiberglass over that...The whole thing can't weight more than 100 lbs...likely less....I made it to fit the old stainless supports and added some awthships bracing...the thing holds me...spread out on my stomach...I figure 100 lbs at that height is about the roll effect of an adult on the bridge...not noticeable,,, I included a pair of opening 2ft x 2ft hatches...I like them but it's amazing how often sunlight is right on my plotter screen!!!..They are about 18 inches from the front edge of the hardtop...Wind deflection from the flybridge front prevents most wind from getting in..opening a front zipper admits a lot more breeze when underway...My Yorkie likes the hatches because sometimes she gets to doze in sunlight on the flybridge... If you run from the flybridge often as I do, you'll love the hardtop...no more drips from overhead in rain. But wind driven rain WILL come in from the zipper soft enclosure, so it's not perfectly dry. good luck.