Since they are only extensions, they should fit most power supplies. Since they are the same plugs that also fit the components. Should not be a problem:)
hi
yes looks good, but you could use a cheaper power supply with 650W e.g. "Corsair TX650M (650W)" is only partially modular but you need the 24-pin and 8-pin Cpu connector anyway and since you use extensions it doesn't matter.... since you have a very nice build (except graphics card) you COULD go to a nicer RTX 2060 Super since the performance is almost identical... but the emphasis is on could since that is just for looks... otherwise I would leave the 2070....