True, a hard case has to be stored, or shipped to your departure point.
tape and a 2nd hand bike box cut down will be fine..
I got a heavy canvas cover bag, not sure I'd even tow it in the bottom
of my trailer.. on a long trip.
but it is rugged.. My Mk2 Brommy's previous owner had it sewn.
how easy and fast is it to get replacement parts?
SJScycles.[UK] stocks lots of Brompton parts and subassemblies,
and they ship world wide.