^absolutely get the bike how you want it set up with items that are clearly distinguishable and discernible at the time of the registration as that is how the vehicle must look at the time of re-inspection etc. So if you are planning on cases, top box, bigger items that will likely standout then fit them first then do the reg. Far easier than having to remove everything later. It isn't always a problem but it can be, as is usual TIC and guanxi can and does come into play. You can be seen by two different cops and one, or other, or both, or none, or the same, or the other... cop can take issue with something that looks different... take your pick.