I had a root around in my bag of micromachines this week, and measured some of the likely figures for use with X Wing Miniatures. It seems that (according to Wookieepedia) the X Wing, Y Wing, and TIE/In will work, and the other stuff will not.
Measurements and detailed results
here.
As an aside, for its size, the Skipray seems pretty underwhelming, with basically the load out of a B wing plus a puny turret.