"1. How long do you think you will keep a layout where it is built and stored.
As long as fate allows 
. But modular makes sense as moves are always possible, one way or the other.
"3. What size are we discussing? 0 Gauge? 4'x8' layout?"
Something between 10 x 10 and 10 x 20 so there are at least 72 inch curves for larger passenger cars. No big steamers at present, but do have 21 inch passenger cars.
"4. Where will this be set up and/or stored?"
Set up. We've got basements here and we've got a rather large one with next to nothing in it at present, except for two furnaces and a hot water heater that aren't in the way. Cool in summer and warm in winter. Dry thankfully. Central air.
"5. Where do you live?"
North coast of NY State near one of those big inland seas .
