We are on a forum of passionates, who create, and share their solutions to modify certain parts of their tank, each one having different techniques and means, it will not be easy to make a specific tutorial? who is going to want to take in their free time for that? instead of building? moreover I think that this forum (otherwise very complete) already provides a lot of information, of course you have to take the time to consult each post (it's tedious) but there are many answers to all kinds of questions. There is also the section "Tips" this is only my personal opinion.
For episcopes, the simplest and when it is possible? is to use those shown in the photo above, because easier to paint, a light black line around the perimeter, and a "stained glass" paint color green, slightly bluish or shiny, see Mig paints, some use an aluminum paper sticker, on which is added a green plastic film, etc.etc.

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