Wanting to build a rack

[Kavyrie]

All 7 of my babies are in tanks, and I really want to free up space around the house. I also came to realize very quickly that most of my snakes will greatly benefit being in a rack rather than a tank (I do my best to keep the humidity up, but its not easy). I don't really want a rack with tubs though, because honestly I just really love being able to see all my guys going about their business, so I'm hoping to get a bookshelf sort of thing and install sliding glass/plexiglass doors. I haven't built anything before though, so I'd really appreciate some advice on what I should be looking for. What kinds of wood would be ideal? Would it be okay to just buy a bookcase and seal it, or should I build the entire thing instead? I'd be housing my ball pythons and my BRB in this rack, and have a few slots ready for future snakes. I was thinking 6 spaces would be good to have. What would be the best way to ventilate the rack? What kind of heating should I get if it is made out of wood?