I'm no nautical engineer by any means but I have decked a few boats. The biggest factors to consider when doing decking is #1: Don't compromise the integrity of the structure if it can be avoided. In other words don't start ripping out structural components like bench seats, etc., without considering how you will compensate for that removal. Study the structure BEFORE reaching for the saw, grinder or whatever you'll use for metal removal. I'd make a suggestion that you try to incorporate the structure such as a bench seat for example instead of removing it. #2: When trying to figure out placement of the deck study the design of the hull, stare at it for a while. What you want to consider is the CG (center of gravity). This will determine where the weight is displaced in or sometimes on the hull (flush decks). Almost every time you start placing weight in your hull you affect the design. Too much weight up front affects the boats ability to plane and also the ride quality. Same thing goes for the back. The flatter the bottom the more stability. With a modified V or boats with a coast guard front on them the better the ride but they tend to pitch more than the flat bottom ones. If you're a big guy or gal you bring more weight to the equation. When you stand on a deck your weight is above the CG of the hull and contributes to its tipping characteristics. You wouldn't try to put a deck on a canoe for example, you know that it's not wide enough for the weight above the gunnels, same thing with the bigger boats. Just a suggestion here. If you'd like to make a deck addition to your boat place a plank on it where you like the deck and try it out. If it seems kind of tippy maybe put a milk crate in it on the floor and see if that's better. If you fish with a partner you can also place some old tires in it to duplicate the extra weight of them and not have to worry about them falling over and possibly damaging your hull while you figure things out. There is no single answer to what works with a single hull for everyone, you have to experiment a little. This is my personal experience and what has worked for me.