The message
from Organoman contains these words:

1) Could I build the garage around the meter? I'm guessing probably not.

Can't see why not.

3) I imagine having the flue rerouted wouldn't be a major headache. Is
this the case?

Not always - you may be able to have a vertical flue from the old
terminal to one of the garage roof.

--
Skipweasel
Pay no attention to that man behind the curtain.