bufferbeam stay etch
On the prototype there is a plate and a pair of triangular stays at each of the 4 corners. The kit designer says that he omitted the stays on the front corners (from most angles they are hardly visible behind the front steps). Instead they are represented by etched flat lines on the front plates.
The intention is clearly to match the tabs with the slits in the plates and also in the sideframes. I filed so much off the tabs to make them fit that I decided I would be better gluing them together.
stays glued to rear plates
glued against back bufferbeam
plate with flat "stays" at front