A bit belated, but here's pictures taken in the daylight of the rear seat delete that's gone in. I tried to find #100 Instapak Quick RT to put underneath but it was impossible to find so I went with #80 (next size down) and I'll be doing foaming underneath to reinforce the pieces that cover the seat section tonight after the Instapak arrives. I'm also planning to put the trunk mat back in by taking the bar off the rear strut tower brace and then cutting slits in the trunk mat. Since I have a BRZ Limited I also have the rubber all-weather cargo mat that goes over top. I'm still not sure what I'm going to do with it, I may leave it out.
My goal would be to be able to fit all 4 of my new wheels in the pack (with some padding) to get them to the tire shop without requiring a second vehicle to carry them.
When you install it, it basically looks like this when done. Pretty clean looking although everything is based on push-clips rather than bolts. Since it goes in as 4 sections (left and right bottom piece, back piece, and the brace/base) it's easy to install compared to one-piece solutions although it doesn't look as clean.
As you can see the 10mm bolt holes on the bottom of the rear set gets covered by a little piece of plastic with a single push-clip. It tends to randomly rotate or loosen slightly, so I'm sure they'll fall out tomorrow when I go to the car wash and vacuum out the car. It looks a bit janky, but I guess it's better than exposed metal underneath.
The rear piece leans against a lip created by the brace/base that mounts using two of the washered bolts from the child seat restraint bracket and the top two mounting holes from that bracket after it's removed. The bottom pieces use two push-clips to attach to this piece and the rear piece is attached at the top and just held in against the base by pressure.
In the rear section you can see it looks very clean on the back of the trunk, but it does come forward into the trunk space a little farther than the rear seat which made reinstalling some of the trim difficult. Additionally, it means I may need to slightly trim the trunk carpeting other than what was necessary to fit the bar (this is still yet to be done, but probably will finish it tonight).
Anyway, that's the Shrader Performance Rear Seat Delete Kit as installed. I'm overall pretty happy with it. I just got my Amazon package with 2x Instapak Quick RT #80 in it, so I'm going to be removing the bottom pieces, laying down some loose padding and then creating the foam blocks to fill in the empty cavity between the bare metal of the body and the underside of the two bottom pieces. I'm hoping this will increase it's ability to support weight while also adding additional sound dampening capability to reduce NVH further.
Regarding NVH, the difference between bare stripped interior and trunk vs completed interior and trunk with the rear seat delete kit installed is night and day. Compared to the NVH level when the vehicle is stock I think it's only marginally louder. Mostly I need to figure out what's rattling around back in one of the walls covered by trim (I suspect I broke a pop clip reinstalling trim). Otherwise this is on point. Cuts 23 pounds of weight, provides a flatter surface for items to extend from the trunk area when the rear piece is removed, and it turns the car into a true 2-seater as it should have been from the factory
Cheers