Installed seat channel and back rest, and gussets 6-B-15-1R+L. Back rest has to be cut Than mounted doublers 6-B-16-4 again. With clecos, to begin with. I think the manual, on page fuselage 15-18, need to be modified, so mounting can be done in right order. It´s good to have Didier Voinchet´s blog to look at. He has gone through this earlier... Unfortunately the French language is quite difficult to translate.