Thanks guys!
Shamus, I wasn't planning on a hole in the middle...unless of course it's an around-the-walls type thing.
Tyson, I am definitely going to do a section at a time for so many reasons. One main one is my lack of experience. Don't want to commit to one huge mistake, say in track-laying. Prefer many smaller ones!! Then there's the $$...
Vic, I know, all that STUFF!!! I
am going to move it off into a corner, and that's the first decision - which corner. Sounds like the consensus is to take the long, narrow portion for the layout and put the junk, I mean priceless artifacts, into the bottom part of the floorplan.
Ted, that's a great idea about the masking tape! I'm not so sure I like your other idea though, the one that has to do with cleaning everything out!

Sounds suspiciously like work to me.
And I'm also going to have to slap up some drywall on that cinder block too. Uhg - how I hate, loathe and detest drywall sanding!!!!!!
Anyway, thanks for all the great input and helpful suggestions. The next thing I need to do is a trackplan for the switching section and the trolley run section (2 "modules") and worry about looping the mainline later.
cheers

Val