If you want to share your work with others, why not share the *.x file? I fiddled with trying to convert a gWax object to a macro for a couple of days using Fsregen but could never get the scale to come out right, was always twice the size it should have been. The process as outlined in the Fsregen is not real clear so untill I find a GOOD tutorial on making a macro, I'll just place my objects using Makemdl.exe with a dummy object in the Airport file to take the place of the gWax object(s) till the scene is finished.