David has kindly sent in these tips to share with others in the hobby:

Just read your tunnel problem with not being big enough and thought I would add something to it.

When getting ready to plaster a tunnel use heavy duty aluminum foil to line your tunnel.

It won't allow any drying plaster debris or anything for that matter to fall on your track. At the tunnel portals area you can actually crunch the foil to resemble rock work inside the tunnel and spray paint it to look like rock work. Keeps your tunnel free from all debris and keeps track clean.

I have actually been using it instead of wire to form mtns. and hills and then using the plaster cloth on top of foil. You can spray paint foil first-add plaster cloth-then do your ground or rock work. Easy to use and very inexpensive. I have also crunched foil up to resemble rocks and used the foil as a rock mold and poured hydrocal in and made really large rock formations. It really makes great looking rock formations.

Take a sheet of foil about 12" in length and just crumble it up-then carefully spread it back out and you will see the wrinkles and the rock formations appear and then add your plaster cloth and try settle it into formations. Give it a try. Can be used over for molds. Spray with wet water befor pouring hydrocal into foil mold.

Readers might also like to look at these tunnel tips submitted by Geof http://modeltrainsetshelp.blogspot.com/search?q=tunnel

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