Some years ago I saw an article or ad for a fiberglass tunnel form. Since I plan a short curved tunnel, that sounds perfect. Does anybody know anything about them? TIA!
Why not build your own! All car parts and big box stores sell GE/Bondo fiberglass kits for restoring/fixing auto. build a skeleton out of chicken wire cover with fibrglass and paint on resin with a paint brush. The resin runs for about $35.00 gallon quarts about $17.00. If additional fiberglass is needed it can be bought from many distributors of cancoe/kayak supplies. i.e US Composites, ClarkCraft, etc.
It is an easy process.JUST FOLLOW SAFTEY PRECAUTIONS I have used it to build hollow rocks to hide electronic, water sprinklers, etc Bridge abutments, etc.