Cage size minimum for WLP

[That Guy]

Hello all. First post here. I seem to have trouble finding many post on WLP. I recently picked up a juvenile pair and i am going to build them cages(separate) my question is, what would a minimum size be? I read they like multiple hides and can be climbers. I want to build a stackable cage so i dont want to go super high. Just trying to see what a suggested h×d×w size might be for when these guys become adults as these will hopefully be there first and last cage. Also i read different things as far as heat goes. Would a covered heat tape be best or should i stick with a heat pad and heat lamps.

Thanks for the suggestions.