Fishroom or not to Fishroom...

As a kid growing up in my parents house... condo, three bedroom condominium in Prospect Heights, IL I had the second largest bedroom.  In that bedroom contained four or five 10gallon aquariums, a 20L, 20(not as long but a little taller than the 20L), 45gallon, 58, 120, and my pride and joy a 6' x 24" x 24" equating to 180 marvelous gallons of with I could create many biotopes.  Now that I am after all these years finally a home owner I wish to create a space dedicated to aquatic pursuits.  My wife and I have discussed putting up a small add on to the garage where I could practice my aquarium keeping proclivities. Like any infected aquarium-holic you are forever looking for more space and larger aquariums. It's Becoming apparent that I am eventually going to need a public aquarium to quell my affliction, maybe. I have to have enough room for my 180 gallon on one wall and my 120 gallon plus a rack of tanks on the other wall as well as a number of smaller tanks for quarantine, breeding, newly hatched youngsters and grow out tanks, whew!
     Having an aquarium other than one in the house is not an option as we have no wall free to accommodate aquariums. The other thought was that since my wife's Tahoe does not fit in garage maybe I can use part of it to keep my future charges. Although much work will have to be done and some significant hurdles overcome to make that happen. 

This is our spare bedroom.  Small and its current use allows for few aquariums much less large aquaria.

Our front room, no wall space at all.

Front room opposite view, still no where to add an aquarium.

This is our back room.  Tons of room but already claimed by family.  The seemingly bare wall with stenciling would be a great spot for my 180 gallon tank but would interfere with stencil.

So, here is our garage.  Not large by any measure but if insulated and heated for fall and winter and perhaps engineer a way to take the edge off the heat in summer...  I could have a good size fish room!  

I find myself between a garage and a small add on space to cure my fish room ailment.  Will keep updating as this standoff unfolds.