Only thing I'd add...
Your pumpout deck fitting is actually 1.25". The marina pumpout may have a neoprene "universal" nozzle that seals just fine, but must be held tightly in place to do so...or it may have a threaded fitting. Some self-service pumpouts don't have either...you have to supply your own, which attaches to the end of the pumpout hose via a cam coupler. I suggest you acquaint yourself with what's needed and how to use it BEFORE your tank is full...which is likely to happen a lot sooner than you expect.And since you don't want it to overflow out the vent, I guess I'd better add one more thing: how to estimate how many flushes your tank can hold...'cuz they fill up a lot faster than most people think they will. The average flush is a little over 1/2 gallon. The average adult uses the toilet 5x/day...which means each person continuously aboard is gonna put roughly 2.5 gal/day into the tank. If you know how many gallons your tank is supposed to hold, basic math skills will tell you how many days it'll take to fill it.If you have no previous experience with marine toilets, you might want to check out the link below to learn how to use and maintain it...'cuz it's a lot easier to prevent problems than it is to cure 'em.