Double notch: the bottom notch lines up with the bottom of the end plate.
Full depth: the plate takes the beam depth, the bolt rows are set from the top of the beam, and the plate is welded to the web and both flanges.
ArcelorMittal Orange Book. EN 10025-2 (JR/J2). A supporting beam is taken with its top level with the supported beam.
Hot finished RHS column (SCI P212): Flowdrill (Table H.55, Dh = d in the wall) or Hollo-Bolts (Tables H.56 / H.61); Check 15 replaces Check 14. Gauge g at least 0.3b.