There was something similar on the wall at David Holmes BMW in Stockport (although I think it was just a sideways blue Z4MC) with about 6 inches (15cm) between each of the panels.
I mentioned I had a Z4M and I asked if they'd sell me one, but they said it wasn't a retail item but part of their BMW branding and it would be 'dumped' when they changed. I asked them if it would be possible to 'reclaim' it from the bin when they did a refresh and was told they'd let me know.
Went in a few months later and the dealership had changed to a Williams, decor changed, no sign of wall art, and no contact from them :thumbsdown:
Did my own instead (my car at the 'Ring), albeit a fair bit smaller.