I thought I saw some specimen plants in your beds. Japanese Maples, Rhododendrons, Azaleas and such? I understand not wanting to dig up beds that have well established plantings.
My hubby is an avid collector of Japanese Maples and we have several really nice ones as specimen plantings in our yard.
To answer your question about building inside your building, you certainly could build a terrarium inside your garage. Check out the forum here. There have been several recent posts showing setups and they are really nice. That would probably be your least expensive route and you could still have a multi-functional building depending on how big you decide to go. It will be interesting to see what you decide.
