If i had one that large, i don't think i would be worrying about another building. I do have a small tractor for plowing snow (Wheelhorse) but again 30x50, i would survive! LOL! 18 inches for size, how big is the blasting cabinet? im working on a 3X4 foot, should i go larger? I wont be doing this often, just my own stuff and mainly my front end parts when i re-do my bushings, i thought id try some valve covers and all engine brackets, intakes maybe.. And can you use a propane stove instead of electric? i cant see why not, its not like the flames themselves would be hitting anything your doing.. This may sound like ridiculous questions but im not one to jump in without some checking and some opinions..