Sailors who aren't familiar with the

got the picture easily when I described my Beija-Flor as "an obese Flying Scot with indoor plumbing." But I enjoyed the boat very much for the two years I owned it. I was looking for a West Wight Potter when I found Beija-Flor at a small-boat sales outfit in my area - it's about the same size, though it's very much more "powerboat" style than the Potter.
I believe the Mac 19 was the prototype for the 26X/26M motorsailers. It was built with a hard-chine "powerboat" hull, and of course those water ballast tanks and a lightweight centerboard (with a truly awkward cable run for the centerboard pendant). The hull was rated to take a 40-hp engine, and of course it would get up on plane with that much power. (I used a 9.9-hp Tohatsu on Beija-Flor, which pushed it along at hull speed - but I didn't buy the boat to be a powerboat!)
The Mac 19 has sit-up headroom belowdecks. It does have "accommodations for 4" if you're used to a backpacking tent, a tiny cubbyhole for a Porta-Potty that was barely big enough for me to haul up my pants, and an itty-bitty sink that I never even tried to use. I did sleep over on the boat a dozen times or more, at the dock of a marina that was five minutes' drive from my office, and it was comfy though challenging to get dressed in the morning.
Magnetic, where did you put a cooker on your Mac 19? I didn't feel there was a place that I was comfortable with putting even an omelet stove. This was one reason I moved up to my present 26X; the other was that I wanted at least a little bit of stand-up headroom.
Tiller steering, yes - and sometimes I miss that, although it could be damned awkward because there was no tiller-engine interconnect. I used to pull up the rudders and use only the engine to dock the boat. I ran into trouble only once, when a "know-best" crewman pushed the rudders one way while I was pushing the motor the other way - and we did a minor "crunch" on a boat in a neighboring slip! Luckily, we only damaged the other guy's anchor....
The Mac 19 gave way to the Mac 26X in about 1996, I think. Roger proved his point very well with it - that people would buy, sail, and love a "crossover" motorsailer. But I believe he was right to change production to the 26X - not so much more boat that it beomes difficult to tow, set-up, and launch; but enough more boat that you feel you're "living aboard" rather than "backpacking aboard."