Alan, this sounds interesting to both dance and to watch.
The track for 1M and 3L in bars 3-4 is a long way. It may be more manageable
if they just cross rather than cast and cross. Alternately all six dancers
could pull back right shoulder on bar "two" of the setting, thereby 1M and
3L having a better chance of completing their track.
(Assume all facing partners across the set to begin)
1 - 2 All 3 couples set
3 - 4 All pull right shoulder back and cast one place clockwise round
5 - 6 All cross giving right hand with person *opposite*
7 - 8 All chase one place round clockwise