Dropping a large chunk of combi/deci/etc on a map to show power or fluid values looks really messy. Would it actually possible to have say, a 1x1 or 2x2 Factorissimo "Circuit Building" so we could create complex setups inside that and treat it like a single "compact circuit". It would only be allowed wires and circuits inside of course.

I have no idea if this is possible, useful to others or even a good idea. But Id certainly use it a lot.

+1
maybe filter whats allowed to be placed inside?
tho i bet that takes a fair bit of work to implement,

or alternatively don't have the usual ports, just some pre-populated factory circuit combinator

relevant to this https://www.youtube.com/watch?v=9dzQge6pe2o&t=133s

And yes I was thinking of this too. 15x15 building or such, maybe smaller

Take a look at .. https://mods.factorio.com/mod/circuitchips

Mod circuitchips ( https://mods.factorio.com/mod/circuitchips ) unstable, complete incompatibility with third-party combinations (the filter of build is implemented in the mod), a terrible entry mechanism (when debugging a scheme, you’ll go broke on a teleport item)

Filter of allowed build no need, better pre-populated factory circuit combinator.

Вue to the small size of the subject, problems may occur when using the standard input mechanism - it is more convenient to pin it to a click event