My exo terra in progress

[Axle-n-Lily]

Welcome all,
I have been looking around at a lot of enclosed setups around here and I was inspired to try and make one of my own.
I started out with the 24" x 18" x 24" exo terra tank and made an acrylic top to fit where the screen was. I am thinking of mounting the 4" variable speed fan on the acrylic top with bolts and maybe 2" spacers to keep the fan away from the top. Any thoughts on which direction the fan should face or fan location?
I have 2' T5 4 bulb fixture I plan on using for the light source, I currently only have 1 bulb for it. Any good links for cheap replacement bulbs would be much appreciated.

Heres a pic of the tank and top I made

And here is a pic of my fan, it goes from 50 cfm to 100 cfm depending on temperature.

Thanks for checking out my thread, any advice or questions will be much appreciated. Last pic is where I am currently at. I still have no idea what orchids to put in it, way too many options. I am thinking of maybe starting a miniature orchid collection, but I am going to have to wait a while on more orchid purchases for now.