How to go about making a second floor

[tiedxupxinxknots]

hi, i was thinking of getting an exo terra glass terrarium and building a second floor on it, but how would i go about doing that? and is it even possible with this 24 x 18x 18?

 

[acpart]

Do a search on the forums for "upstairs" or "second level" and you'll find pictures and ideas.

Aliza