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Cross isn't the place for weight weenies.
If you're doing rim brakes, I'd urge you to go with track ends and commit to this being a SS race bike. Sliders and EBBS are overly complex for rim brake cross bikes and just provide more opportunity for mechanical failure. Alternatively; commit to it being a geared frame with vertical dropouts and build an ENO wheel for running SS.
Also put a set of water bottle bosses on it and be done with it; otherwise you'll regret pigeonholing yourself when the day inevitably comes that you want to take your beloved race bike on a longer ride and you're stuck with camel pack or a bottle in your jersey pocket.
It'll be built as an out and out race bike. No mounts, no bottles bosses and cantilevers.
I'm leaning towards sliding dropouts. It'll give me the ability to switch to 1x10 with a change of slider too. How much extra should I expect a frame to weigh, in total, over track ends?