There was another twist in the story of this model. Last November after returning from IPMS contest, I was placing models and trophies back into my glass cabinet. Somehow one of the heavy wooden trophies slipped behind from top shelf onto lower one and landed on MP4/22's rear wing. Rear right suspension and rear wing were damaged.
Fortunately damage was repairable. I've since re-applied CF decals to insides of wing end plates and put clear coat over them. Then reassembled rear suspension and finally put together rear wing last night. I've used different jig this time and managed to avoid formerly present gap between top horizontal planes. It's again not perfect, as end plates ended up not exactly parallel to each other, but it'll do for this build. I'm just happy to have this model back on the shelf in my cabinet. I love this car.