Nice work. Were you nervous at all about how it would affect the car's driveability/character?
I was fairly reluctant to do the trans swap in my Firefly/Metro (but I also went far beyond, going with a tall final drive that was never intended for the 3-cyl drivetrain). And now I want an even taller top gear.
Did you already have the HX trans on hand?
(EDIT: added this to the home page.)