Hi Pringles,
That reference face layout of the cross frames appears to be quite correct.
The two cross frames that face the threshing floor should face each other and this would equate to frames 2 and 3 (counting from the north). The tall entry & lower exit doors should be found in this bay (2-3) opposite each other.
Both gable end reference faces should face outwards i.e. frames 1 should face north and frame 5 face south.
That leaves frame 4 which can face either way but in house should face northward i.e. oppposite to frame 5 or in a barn probably indicates that an upper floor (hay loft) is / was present.
Regards
Ken Hume