Yup, it's illegal, but I've done it on several bikes including the Bonnie I run now, coppers are ok about it so far, though I have the normal plate underneath and carry the tools to change it under the seat. Even if they did prosecute, it's not points. Depends whether it's worth the risk or not.
Fatbob looks good, but trust me there not all that. Five years old and every time you try to disconnect an electrical connection it crumbles. Mudguards were already bubbling with rust. Frame was rusty under the seat. Fork stanchions been changed once under warranty, paint has now come off again. And it is a pig to work on, and then some. Not only is everything imperial, but there's no captive nuts like on a jap bike.so even taking the front mudguard meant trying to get a spanner on the bolts behind whilst you undo the imperial Allen key bolt on the outside....all the way through the thread length as the nuts are all locking so they don't vibrate loose...undo all 4 and you've lost half an hour just taking a mudguard of and skinned at least two knuckles...
They hold there value...if your a typical harley owner and do a thousand miles every five years with dealer history servicing...get one like my boys that I've done 12000 miles on and serviced myself and it's worth bugger all in real terms..
good job my son will never sell it and then pass it on to his boy, my grandson josh.