early to bed and early to rise makes a man healthy and wise. Or something like that. Anyway I have a couple of cents to spend.
I’d lay the main on cork or Woodland Scenics roadbed but leave the sidings and yard right on the foam. Use sifted peat moss or dirt or cat sand (clay type only) for ‘ballast’ in the yard - unless you have a cat in which case never, repeat never, put any cat sand on the layout. Cats know that smell and what they do when in it. If you have to ask how I know, you don’t have a cat.