> I do not have a jigsaw,
Building a model railroad layout without a jigsaw is like spreading butter
without a knife. You need to find a friend or neighbor with one or buy a cheap
used on via Craig's List on the internet.
> unless a handsaw can be used to cut MDF,
I have never used MDF for a train layout, but the shelves I have made with it
have always sagged a little bit. Then again, heavy stuff was on the shelves.
But it is not really stiff stuff.
> do I need plywood (or OSB) underneath the 2" foam?
Many modules are built with 2" foam and they seem to work just fine. Add a few
more under-foam supports if in doubt.
> Would 1/2" foam be fine?
Half inch foam would be not-so-fine. You have a two foot span to cover and the
weight of an engine and car(s) will cause severe sagging. Too much strength is
better than insufficient stiffness. Overkill is better than underkill.
Have fun...Ed L.
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