Jesse,

Looks like you have a good idea going for what will work for your boat, maybe Skiers Choice just used a low budget valve that was poorly designed. I chose to go with the Tsunamis because I like how reliable they are and they pump a good flow rate (11-13 GPM per pump). I was able to install them close to the bottom of the boat, but it is a pretty tight fit.

I hope your design works well for you, thats all that matters. Send some pictures when you get it installed.