I'm redesigning my HOn30 micro because I'm not happy with commercial offerings in HOn30 track. My choices were Tillig or Peco, and both are code 80, and my current layout has a mix of Peco and Atlas code 80. I ordered a #4 jig and a bunch of other stuff to get started, and it should be here early next week. I see Tim had worked on an N scale micro with code 40, using blue foam and WS foam roadbed. The current layout is 1" foam over a 1/2" ply base. I am not much of a carpenter, so I'm stuck.
I need to keep weight down, because I want the micro to be portable, but I also know that I need BULLETPROOF track to get these little buggers to run well. So...can I slap some 2" foam on a 1/2" ply box base (with intermediate supports of course) or do I need to have this over engineered monster?
The track will be laid directly on the sub roadbed, or I may lay it on 1/8" hardboard.

Thanks for the help! I'm ready to cut wood, so the sooner the better!
Rich