Re: 19" top bar hives
If you use a Langstroth frame in the hive it is called a Long-Idea hive. In the early 1900s a commercial beekeeper in Florida named O. O. Poppleton used several hundreds of this type. The hive was 30 to 35 frames long, and naturally required two people to move when relocating from crop to crop. I made one years ago, the largest number of frames with brood it produced was 15. It's wintering ability was average.
40 years - 25 colonies, 32 Nucs - IPM disciple - Naturally Skeptic