Nice write-up on your web-page.

It's a shame that MS didnt just pull in the whole Garmin 530 simulator
into FS2004 - the only reason I can think of why they didnt was to
simplify it so that it would be easier to learn and document. Or maybe
Garmin refused to let them do that because it undermined their
licensing arrangements with other 3rd party vendors who interface the
real thing to flight simulator.