Just a thought: it might be helpful if you listed the year of the Mini you're working on. It looks to be a 2013 or earlier. My 2005 had a similar setup, but my 2014 has the springs and dampers mounted separately rather than a coil-over setup. They all look pretty similar from the angles you're showing though.
Hi, what is the rear brand of strut assembly that you used?
Just a thought: it might be helpful if you listed the year of the Mini you're working on. It looks to be a 2013 or earlier. My 2005 had a similar setup, but my 2014 has the springs and dampers mounted separately rather than a coil-over setup. They all look pretty similar from the angles you're showing though.