Ahaaaaa... nice ^^ So the "DeepSkyStacker" of macro photography... never heard of that before, thanks!
Will be my first dip into macro, undiscovered space lies before me. xD
Already thought about such a rail, will look into it later on.
PS: since you've outed yourself as a routined macro photographer, don't be surprised if I ask stupid questions at some point... YOUR fault muahahahaha xD