Yes, please don't take that the wrong way. We have a tendency to split hairs a bit here, especially when we're bored.
I rebuilt all the solid bronze portlights on our previous boat, and it occurred to me that the knowledge I had gained in doing so was pretty valuable. I simply don't have time for a sideline business like that. If you do, I could easily see how it could be worthwhile.
What I would suggest is a sort of "turnkey" approach, where you make it real easy by sending the client a bunch of "blank" covers for their portlights. They remove their portlights, install your blank covers (to keep the weather out), put the portlights in the same box you sent the blanks to them in, and ship them to you. You rebuild in your shop, then ship them back and they return the blanks.
Come up with a fair price per portlight and it could be profitable, who knows? All the best of luck to you.
