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JCW GarageInterested in John Cooper Works (JCW) parts for your 1st Generation MINI? This is where JCW upgrades and accessories for the Cooper (R50), Cabrio (R52), and Cooper S (R53) MINIs are discussed.
If ANY professional Engineer says that those plates on the top of the tower offer much protection, he/she "bought" their degree. I'm retired now, but was in Aerospace (both planes and satellites) industry as a Mechanical / Test Engineer for many, many years, so I've got an idea how things work. Notice the "Test" as part of my title..!
I'd say, as a rough guess, that the aluminum top plates offer about 20% protection.
While the steel plates UNDER the tower will offer 100% protection.