First thing is determining if the outside skin is bonded to a honeycomb structure or bonded to luan sheeting.
My 5er in sig had a small area on the side upper front corner that the filon had delamed (2' area) from the luan backing. I drill holes in the filon per service guys recommendations and injected adhesive he gave me. The trailer sat in a barn so I was able to use the side of the barn to jack a piece of plywood against the work area.
I haven't done a google/youtube on the subject but there should be lots of input on delam issues and how each job was done.
"good judgment comes from experience, and a lot of that comes from bad judgment" ............ Will Rogers
'03 2500 QC Dodge/Cummins HO 3.73 6 speed manual Jacobs Westach
'97 Park Avanue 28' 5er 11200 two slides