I’ve only just discovered this thread. Great work!
And way above my pay grade and probably ambition, too, as witness that I thought a “Legacy” conversion must be a misprint for ERR TMCC. But the boards and controls I can make out in your photos appear to me to be Legacy, not TMCC.
That’s intriguing although I might be out of date or under-informed about getting Legacy components. I thought, however, that they were coded for specific engines.
Anyway congrats on a fine project.