I started this project a few weeks ago, but unfortunately have not gotten terribly far due to my travel schedule.
This paludarium is 36"x28"x54" internally and sits on a 36"x28"x24" base. There is 2x4" frame construction and the panels are made from 5/8" hardwood plywood. This project is nowhere near complete and is already getting heavy. (I made the 28" depth so that it can fit out of my apartment door if and when I need to move.)
Here is the base or stand that will house the sump and other electrical equipment.
The panels were then attached.
I used exterior screws to attach the panels and used quite a few to help make everything rigid.
I started working on internal bracing for the panels before I left on my last trip, but don't have any pictures yet. I'll connect all the panels over the stand with 1x2"s on the inside and brace around the bottom and top before using fiber cloth and marine epoxy to seal the inside. I'm going to make the entire front panel a solid sheet of glass trimmed with wood around the outside 1-2" in order to avoid having a visible seam on the front.
I'll cut two large doors into the sides for access and cover them with wood trimmed glass doors. I plan to keep the top open for ventilation unless I find that enclosing it and adding vent fans helps with humidity. I want the tank humid inside, but not so much as to cause condensation on the glass. I'm still deciding how I plan to light this rather tall structure.
I plan to set this up as a cliff face with several growing tiers and a cascade pool before the main water area in the front of the enclosure.
Hopefully, having a 5' growing height will allow me to use some plants that aren't commonly grown in riparium or paludarium set ups due to space constraints.
In retrospect, I now think I may be happier with a paludarium that is 48" across the front, but there's no reason I can't build a second right?