These aren't the best pics but they were built with the same idea you have in mind, ease and convenience, especially after a long day/weekend enjoying the water.
I do not know how high your ceiling will be, but as you can see from the pics, you can extend the length of the angle iron to hang as high/low as you like. Currently, all of our boarding stuff is in our shed for the winter to free up space in our garage so you do not see any boarding stuff in the pics. But in the summer time, these are very handy & intended for you to be able to back your boat right in/under these and then from the inside or sundeck of your boat, hang your jackets, towels etc up. There are steel rods along the side and back to hang things from using hangers (currently have bike helmets, a couple life jackets and misc crap hanging from them). The rubber bungees on the bottom of the plywood are to hang your boards from (tuck your board under one end at a time), and then obviously up top is storage.
They were built with angle iron, some steel rods (takes some basic welding) and sub-flooring (you could get away with using something much lighter than sub-flooring)