I had also considered the Garden, even got SWMBO's ( as Chaz rightly states, the Head Gardener) agreement when I suggested she could be in charge of all of the gardening needed around the track, that naturally needs to fit in scale wise. Problem is we've not sure if we will be in this house for much longer, mind you we've been saying this for years. The garden as it is would certainly make for an interesting project, it's about 90'( +10' patio) long and 20' wide although it has a number of features that would need working around, a large Koi pond being one of them, plus the different levels. It does also have two large workshops taking up some of this space at the bottom, one of which 20'x10' could be used for an indoor section of the layout, again this would have to wait for my eldest son to move his gear out, he himself has already left the nest. I also have my eye on the loft which is currently my youngest sons bedroom, he's due to move out in a few months time, I could make a layout up there, iirc the space is about 16'x12', so I do have a few options.... if only I didn't want to move out of suburbia....decisions, decisions....
Pete