A float on Miracle - 20ft narrowboat

I've decided on retro-fitting a hatch.
I've found a ship builder who does this and brings the fitting to you.
I'm very excited.
I saw your thread on another forum talking about doing this. Good luck with it, hatches are a handy thing to have in the kitchen.
FWIW I know someone who had 2 additional side hatches added and reckoned the work was better than that done for the original hatch by the boat builder.