Hello Peter,
I cannot offer any info regarding a manual windlass but I can show you pictures of the electric Lewmar which I fitted 4 years ago. my objective was to have at least 50m of 7mm chain (had bad experience with rope/chain combo) and also to be able to keep the CQR stowed in the original anchor locker.
I made and fitted a second chamber under the existing one with a new drain hole and mounted a vertical motor windlass on an 'island' fixed inside the original locker, shaped such that a 9Kg CQR would fit around it. I hope the pics show things better than my words.
Best of luck!
rgds
Chris
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