John, 
I filled it with acetone, pressurized it to ~60psi.  Found 2 pin hole leaks, welded up the leaks and called it good.  It shouldn't see more than ~4 psi while in use, so I think it should be good..... 
  
Mike, 
I plan to bolt it to the front side of the fuel cell box, just rear of the mustache bar.  I have just over 4" of clearance there. 
  
qwik240z, 
MSA has some nice ones in their latest catalogue for ~$40, but will need some modification for more inlet/outlets, depending on your application.   
  
I made mine up fairly quickly and cheaply, and it will be hidden under the car, so the bling bling factor doesn't come into play.....