I misunderstood. I thought you were going to use the panel as the tail light panel and not a bumper fixture *hmmm*. That's why I was questioning the light detail. Peter did a bang-up job with the mock-up... I can get some dimensions from my wife's '08 Cooper - the S version wasn't any different in size for that year.
I would like to see more pictures of your car. Front, Back, sides, roof and the inside. Looks great. What did you use for the new rear end?
See what I am working on at Sterlingkitcars.com ThreeTimeTom. Thanks.
I'm looking forward to seeing your "rearend" rework.
My car is getting painted gloss white. Accents will be satin black. I am getting very concerned about the LED tail lights. I am in the dark when it comes to wiring. I'll soon see what I don't know.