I agree with josh. Height of tank will also affect the height of the stand. I m 6’2 and built my stand 36” and my tank is 24”. If I would have gone with a 20” high tank I would have made the stand 40”. So I think it is a question of how high do you want the whole set up to be?
What do you mean by set up? How much water are you looking to make? Are you looking to set it up in a dedicated location or do plan on storing it while not in use?