Hi Al,

>>in some places of the planar mesh has holes.....
when it fails to meet the requirements: flatness ...<<

Planar is very strict in its application. An alternative approach to satisfy your requirements is to select (patternSelectArray) 3 points (rather than 4) of the facets, using the 1st & 2nd points to define a profile and the 2nd & 3rd to define a rail then Sweep. Voila! planar surfaces with no holes: see attached

.>>Your answer in my language and very appreciated by me, and a considerable effort<<

It was no effort at all. I am soon to embark on trip to Cuba, and had been using "translate.google.com" in my dealings with various accomodations, so I simply did one more.

As an native English speaker it is I that is appreciative of your efforts and those of others (Karsten, Marco, Pilou et al).

So thank you, James