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Yes, I do this a fair bit. Sometimes you find you need to sand after the first coat though, this is where the undercoat comes in handy. It also helps to build a smoother surface in some cases where this is important, especially as water based paints don't 'level' particularly well compared to old school oil based stuff.
ectoplasmosis
Airhead
I've only ever used the water based one. I try to avoid solvent based wherever possible.
For the woodwork probably Zinsser BIN Aqua as a primer followed by tinted undercoat matching the top coat and 2 top coats. So little greene undercoat if it's a LG top coat.
That's belt and braces and there's plenty of different options that would get you there. Quality of the ply/woodwork would make a difference too. I do sometimes do different things depending on the surface I'm working with.
I'd be surprised if you need 10lts for the cills/window surrounds etc. 2.5lts would normally cover a lot of that kind of thing.