"Eric" > wrote in message
Edwin,
The propane tank enclosure would be well vented, no argument there. My
concern is leaving the two sides open where the grill drops in (see
the 3 scans above). I feel like I would rather have those two sides
sealed, so that only the head of the grill could fill up with propane,
vs allowing it to vent into the entire enclosure...

KABOOOOOOOOOOOOOOMMMMMMMMMMMMMM

It must be vented and not allowed to build up in the head. It must be
allowed to vent down. If you want to close the sides and add a vent some
other location, OK, but to seal it is just asking for trouble. Have your
neighbors post photos of the aftermath.