The only place where you could conceivably store this without having another conversion or lossy transport loop is under the house. It's not exactly trivial to excavate that much space under an existing structure without having the whole thing come down. I think I've figured that part out but it would still be legally quite shaky and it might destroy the resale value of the house unless it can be made compact enough that it would fit within a standard basement. Insulation is the key problem to solve here.