Another HUP mystery part

[cmperry4]

Will take a snap tomorrow - my batteries were getting low today. I just had enough juice to get some general shots of the ring after I took the pads out, to show the installation of the liner and construction of the pads. Been fighting with all those sheet metal screws on the liner retaining strips the last couple of days - one last stubborn bugger would not budge before I had to leave today. I've mapped and numbered the metal retainer strips - all 29 of them (and one missing, for 30) Ratty sheets of pressboard and tarpaper piling up in the corner.

While, I'm thinking about it - I notice that the filler panel in what's left of the divider - the angled section on the right side - is a piece of plywood held by screws and a kind of flanged nut. Wondering of the filler panels in the rest of the upper divider would also have been plywood, to be screwed in like manner to the frame. Would that have been strong enough to support the sliding window, though?

Tomorrow is Prairie Command monthly meeting, to be held at my rented garage, so members can see and critique my work-in-progress.