Make sure you seal the wood well to prevent rot and warp. I dont know what you have in mind but you can find Marine epoxys that are safe once they cure. A great site to visit is
Geothermal Aquaculture Research Foundation Home Page go to thr DIY pages and go to tank building. it wont let you put in the dimensions for a tank this big becouse they are thinking reef aquariums not Vivariums. You can still get a step instructions. keep in mind your glass does not have to be as thick as they say becouse it wont be full of water. with some ingenuity this can really work well.