I used 3/4 inch melamine for my retic tank, might be a little heavy but very sturdy..... I would highly recomend doors on hinges verses doors tracks if you do not have very much wood working experience..... Hinges are easy but sliding glass doors are difficult. Definatly make your door two pieces, i messed up and made mine one piece thats 6 ft by 2ft. It has hinges on the bottom and hangsdown when open..... My next tank, my tegu tank, will have sliding glass doors because of conviences and the fact that the retic tank and tegu tank will be stacked on each other. My two cents, best of luck.
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