Buster & BOAC are just about right - though I never actually noted the depth of the stubs, they were about 7/8ft long each and about 4-5 inches deep(from memory).
And I did put guards on the leading and trailing edges to stop damage (but to what/whom?).
I used to chuckle at the rescue markings below the canopy (to be read in a yorkish accent) "Break Glass and Pull 'T' Handle..."