I did finally finish the "Balao SJ-I to ST Radar Upgrade" last night, and as expected, it did indeed fail. A new boat is fine and functions fully, but lacks the display of which radar is actually onboard and active. That particular "minor" detail is really a massive clue, it turns out... This falls back to the Stock game's failed attempts at ST Radar and FM Sonar, and I am about to attempt another attempt at the update with several edits in-place... fingers crossed, touching the rabbits foot, staying away from mirrors and salt shakers (and sharp objects)...