After my first 4 years in the hobby as an O scale aficionado I am going to tear down my old 8'X8' layout and put up a new 10'X10' one. Sorry, that is as big as I can get unless we move.
I will be considering what supporting material, wires, braces, and etc., I will reuse and what things I will do differently to improve on my first experience.
I will NOT mount Fastrack directly to homosote or plywood. (noise, noise, noise) I am thinking of finding used green carpet and then some kind on track underlayment. i have too much invested in Fastrack, which I mostly like anyway, to change. I may use bigger wiring for accessories although my LHS says that the 20 gauge feeders I use are fine.
I will plan deliberate spaces for roads and buildings instead of just "fitting them in". I may even have a community separate from and away from the railroad tracks by adding a table as a spur. I will separate residential and industrial sections a little better.
On more easily accessible switches I may go with manual over remote just to save money.
I will add one track specifically for kids to play with plus an operating accessorie or two.
I'd like to have some "Streets" instead of only static truck and auto traffic. I don't know the current status of "Streets" type of equipment.
I will try to have fewer "hard to reach and clean" spaces on my layout.
Any other suggestions and advice are appreciated.