Thanks Colin. I know of the Dragonfly setup (it piqued my interest in the first place a couple of years ago), but I did find a FLI 16801 array, that may have been what Greg was referring to, but it uses a splayed array of four 400mm f/2.8 lenses to cover an 11 x 11 degree field. They use a very rudimentary, what appears to be one bolt mounting of the lens via only the the tripod foot. It would also allow them basic lateral adjustment. If it works, it's good.
It's seen here - The Alsubai Project ....
https://www.flicamera.com/alsubai/alsubai.html
Best
JA