Paul, I bought the bodies pre manufacturing months ago. Likewise I bought the heads individually. I already had some Herter’s brant with upright heads so I bought only preener/feeder heads and positioned them all differently. The bodies are oversized, like the majority of the Homer decoys. I will measure them and post later. As to the head gap, I always glue heads on. I prefer that they not turn and handle them by the heads. I take the heads to the bandsaw and cut them off at the radius. I then coat both the interface surfaces with a coarse media. Once cured, I use construction adhesive to bond the heads. Using the adhesive, I blend the interface to erase line.