The body is dovetailed before the back goes on. I use a parallel dovetail like Bob Benedetto’s in his archtop guitar book. The advantage is, timber can be removed from the bottom of the neck heel to easily get the right neck height relative to the right bridge height.
Most of the waste is bandsawn away, then the body is routed with a bearing on the shaft. Use the same bit for neck and body because the dovetail angle can vary bit to bit. The neck dovetail is cut on the router table, a small amount at a time. The neck blank is oversize and one end is used as a setup piece.
-- Mama calls me Texcaster but my real name is Mr. Earl.