I'm working on adding a bridgedeck cabin to my catamaran.
Quote from a friend who is helping out on the renovations:

"You know the boat renos are getting serious when you're on
your third chainsaw chain".

Chainsaws cut through fiberglass very quickly but the chains
don't last too long, even with frequent sharpening.

Oh, in about 15 days we're removed the old little steering
pod, outboard motor wells, old mast beam, and cockpit sole.

Fiberglassed in a new much bigger carbon mast beam, cockpit
and cabin sole so far. Oh, yeah, I'm also part way through
installing a new diesel (where there were only outboards
before).

Evan Gatehouse