I am planing on getting my first Russian tortoise in a month or so but before I get one I need to build an indoor enclosure since its going to be inside for the colder months. I don't exactly know what's the appropriate size since each website I look at tells me something different. I also want to do a ramp up to a little platform but I don't know what to use as a rail or fence so the tortoise won't fall. Can someone please give me some advice?