I would suggest that the bottom be PVC not expanded just regular pvc belly heat is the easiest to control and the regular pvc is a great medium to transfer heat. The expanded pvc (pvcx) is a easy worked material but takes more effort to heat through in short it is a better insulator.
The real question isn't what is the best design but where is it going? If you have a dedicated snake room humidity and temp regulated the design may be different than one in the living room. The needs change, a cool room location needs to preserve heat a warm place may need to 'shed' heat.
Round corners never go wrong as few places for dirt to hide the better. I like glass sliding doors but I have a BD enclosure with opening plexi doors and rope hinges. That is working very very well.
Dimensions the foot print is variable but I would not suggest height over 18 inches and 12-14 to be better it is too hard to hold humidity and heat in very tall enclosures.
One of mine I designed and built.
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