Im out of my league on this one, but from memory, the 68000 was internally 32bit bit, but external of the cpu the machines (A500 etc) were all 16bit. my guestimate is that the interface to the 68000 cpu was 16bit?
btw, bootable cd's are everywhere now, i guess nearly every platform has them. But getting royalties for it would never be enforcable in court, be harder than trying to get royalties on gif's ;-) but this has been discussed on a.org before...
Does anyone know where, or how to get a list of the patents that are amiga's. I reckon it would be a most interesting read.