I made a bunch years ago. As I recall, they were 4 vertical panel construction. If I had to do it again, I would go with 5 panel horizontal construction. I was using about 1 3/4" white oak with 7/8" panels. I used a dadoe blade for the panels and used the same depth (maybe an inch) for the rails and stiles. I let the panels float of course.
I prehung them in door jacks with threshholds. I was probably stronger then and I remember I couldn't carry the doors in the jacks. Had to install the jacks, then mount the doors in them. It was quite a feat to carry the doors alone.
The mortised-in locksets were very nice. I would use these again if I had the opportunity. They were tough to install. I had a boring jig and whatever diameter bit necessary (1/2 or 5/8), then chiseled them out clean. I thought it looked good on the original pine doors I was replacing, but it was a different story in the white oak. In the original doors they must have bored them out by hand with an auger bit. As I recall, you could see the mark left by the spur on the bottom of the mortise, all the way across.
Good luck.