OK - so the rethinking goes around. We are looking at the immediate pros and cons:
Hatch pattern - Pro:automatic - Con:full wall layer thickness so inconsistent thicknesses
Rail - Con:duplicates work by having to add another element to keep up with - Pro:thickness is consistent
Jury is still out but the thought is possibly going with the rail for one more reason - it can carry on outside of the walls such as through the corner columns we are dealing with and it has the same pattern continuing at the same width.