Waiting for some help about the Kingston valves, I post some photos of the completion of the hole with grating.
In the last photo the photoetched grating is only placed, without glue; I'll have to scrape the hull surface to obtain an hollow of ther same dimensions of the grating, in order to have the grating flat with the hull surface, without protuberance....
Now I'm waiting an help about the Kingston valves....
Cheers