I've got a new overlapping concept I promised Enxio I'd post against, however it is proving difficult to find designable and workable examples. This one came out as a byproduct in my experiments.
It is Sohie, so four puzzles, all Windoku and all X, so quite "restrained" in addition the four crossover nonets contain the old lace pattern making them even more restrained.
The puzzle is not minimal but I'd tried taking a few of the givens away and it fell into the ocean (i.e. lots of fishes).
Pointing pairs, intersections, law of leftovers, a hidden pair and a naked triplet. For those of you with keen eyes - not too difficult. Work the old lace heavily.