Henry;
Yes, I already did, but like B & O, this is also long-term ongoing collection. The Lufthansa Rimowa model Bordkoffer ( or onboard box case ) works, as does the Attache. It fits, but still requires some padding around it. I have this from 1994.
Rimowa being around for 100 + years , has made a box for just about everything or size imaginable. There was, or still is a Champagne case offered, that was padded and opened in a split-side hinged manner, with a lock. I like good Champagne, but I never quite saw the need for it. .
I think the case shown above is the right choice for the price, looking quite smart, but perhaps a bit flash to leave in the backseat of a car. Polished Alu, Stainless Steel, or even Silver metallic paint always attracts the eye. I one had a BS 3 inside, I'd keep it hidden and protected in the boot.