A lil more Merc trivia: They ran a test facility in Placida for many years, near the bridge to Boca Grande. Boats went out first thing in the morning & ran all day long in the Gulf. If the Gulf was too rough they headed east into Charlotte Harbor. Boats were almost always yellow but they did have a couple dark red ones. The place sustained moderate damage from Hurricane Charly in '04 and never reopened.
They still operate a small facility on Manasota Key. Though it's purty boring really. All's they do is hang stuff in the sun & wait for the paint to peel. And soak stuff in saltwater'n wait for it to corrode. WooHoo! There is a "Hustler" hull that's been sitting there for at least 15 yrs but that's bout the only exciting thing about the joint.
I did see a pair of yellow Merc test boats at Stump Pass Marina awhile back, yet I've never seen one on the water. Going over there to bid a job tomorrow so I'll bring my camera & see if'n they're still there.