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Re: Custom cut round plastic window for forward hatch
Romario, it sounds like a simple piece of 1/4" plexiglass (acrylic) that has had a 1/8" bevel cut into the edge with a router. For a plexi shop this is a simply job. But a lot of plastics shops are used to indoor work done cheap, and the raw material is bought in 4x8 foot sheets, so if you want something they don't have, they cleverly try to charge you for the whole sheet and keep the rest. (Ouch.)
For hatches (and ignoring the question of using cast acrylic instead of "structured" aka sheet material) you will get better life by looking for an acrylic that is meant for use as outdoor glazing, that is UV-resistant and scratch-resistant. If you find a shop that doesn't get all upset when you ask about this, the odds are they have the right material and are a better place to work with.
I'd guess the price of the job would be $50-100 depending on local prices.
But the plastic you dropped overboard? Technically, that's a MARPOL violation and a serious fine for putting plastic in the water. If it was at the dock...Heck, you'll save at least $50 by getting a mask and diving down to look for it. :-)