While tripping merrily through the mail, Gerry Calhoun was overheard
 GC> I figured to build an enclosure beside the garage (on the far of
 GC> everything).  
 EH> We DO want to err on the side of safety but if you pump a tank to 
 EH> 400 PSI it's pretty dang safe for 125!
One of the best sources for compressed air tanks I've found, is go to a 
junkyard that deals in HEAVY trucks and get an old air brake tank.
You've got something that was designed for the job, and all the necessary
connections will be there, requiring no modifications.
Don
... He then left in a Huff (A small German sportscar).
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