well i'm building a cage that is 6 feet and teh width is 2 feet do you think it's enough....i cant find a place where they sell guinea pig cage ......and i was going to use my old hamster cage but then i'm afraid it too small for the guinea pig i'm going to adopt....the only problem is have any one build a cage before.....what do you use to make the door and how high should the ......fense...? be....my friend tell me just to use my old aqaurium as a cage, i use to rasie guppy...wait i still do but in a smaller tank 10 gallon.....so yeah but i don't think it would be neccesary to use an aqaurium as a cage....