This neat little terrarium uses ready cut 150x100x1mm Perspex photo frame panels which can be purchased on Amazon, it's about £6 for 10 of them so they are nice and cheap. It can be used for a multitude of projects such as mossariums, terrarium biomes, insect breeding for reptiles, and even keeping arachnids or other critters.

For ventilation you have a choice of an adjustable side vent, vent holes along the rear wall or none at all. The front window slides upwards for access.

It should snap together nicely so no hardware is needed.

For the snap lock side vent you first push the inner plate through the right hand wall from the side with the perimeter ring, then, making sure the outer plate is in the same orientation push it until it snaps on. I had to keep the snap fitting a relatively tight to make it all a nice fit once assembled so try to keep the two plates as straight as possible to avoid damaging the locking pin when snapping it through the holes, I've assembled 9 of them now and all have snapped in fine, you just have to trust it. 

Be sure to keep the keep the brim on the profile, although they tend to print fine without I had a couple warp and thought it best for security. Try and avoid leaving flashing around the edges after removing it.

Order of assembly is Floor, Back wall, Right hand panel, Insert top Perspex, Left panel, then the front window slides down into place.

This is a fully parametric design, so if you have any specific requirements in terms of ventilation hole size or window panel thickness/dimension then let me know and I can easily adjust to your needs.

I'd love to see what everyone does with them so please post photo's of your completed build.