Thanks, @Mayner!
Fabulous info, specially the graphics using the same space!
Looking at the space in the garage, if I set the height at 1100mm off the floor, I can probably get a board 1800mm to 1900mm wide in, while still having space to slide the car bonnet underneath.
So, two very gradual 16,5mm curves today may translate into two very tight 21mm curves in a few years time.