Damn man that is a hefty sump! Looks like overkill to me but I don't mean that in a bad way. Given the size and all you have a lot to work with!
I've never done plants in a sump so can't help you there. But it sounds like you have a nice plan in place. Recently a few folks were raving about the bean animal. W a sump that size I don't see an issue hiding everything !
Sounds like you did your research in size of fish and all. Can't wait to see it all come together. And welcome out of your creeper lurker status and to a full fledge poster!! Haha!