Thanks, I'm gonna seal the inside today and put on the screen tomorrow. Then I'll just wait a few more days for everything to fully dry and it'll be good to set up!
As for the water, it's gonna be filtered for sure and I'm handy enough with a siphon to just do that. I'll probably do 1/2 water changes a few times a week since that's super easy and the siphon will suck up the poo in the water.