From my experience it's cheeper to make a Terrarium. start by finding some acrylic or glass, it will cost $3 or less per square foot. then find some stainless steel corner brackets that will cost $10 for a 8' peace, and last find some silicon caulking witch will cost $8 a tube. the one I made is 46x18x18 and cost $122 and one day to make. and for the one you describing is missing one measurement. to find the price of your Terrarium use this formula ((3.646+8.333X)x3)+((8.333+4X)x1.25)= the price X=the missing measurement in feet in decimal value. Assuming the missing measurement was 15 then the cost will be $60! pulse the silicon and this includes a lid, for a similar size a tank from http://www.bigappleherp.com/Big-Apple-Acrylic-Aquariums?sc=8&category=34 this will cost $139 double the price of the materials. once you have the materials you can start making it by cutting them in to the flowing demotions. 4 peaces of acrylic 15x35 and 2 15x15 then 6 peaces of corner brackets 15 and 2 35, the, glue it and your done.