It is small but I think for short term you would be alright. Just remember that depending on who you order your cage from it could take several months.
I have my brb in a 4x2x15" cage and he makes good use of it. He is almost six feet. The ambient is 78-80 with a hotspot of 83-85. He also really enjoys soaking and spends alot of time in his pool. My humidity stays around 75-85% and he sheds well.