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I love this design, but I'm running into an issue where the little hook can't get around the sleeve clamp. It's because the hook is too thick to slip under the sleeve clamp bolt, because on mine the sleeve clamp bolt is pointed directly at the mounting bolt that it's next to. This may be a recent update to the design of the Nimble. Looking closely at your pictures, I see your sleeve clamp bolt facing away from the mounting bolt, and fitting into the opening of the clip hook.
Step 18: "To place the sleeve clamp correctly, make sure you line up the tabs with the 3 slots on the Nimble and in such a way that when locked, the screw in the next step fits inside the notch."
I'm going to work on a remix, and may include the funnel-esque element to hold the rubber grommet. https://support.mosaicmfg.com/hc/en-us/articles/360012257634-Design-Guide-for-Palette-2-Extruder-Clip
Thank you for the inspiration!