I'd be really interested in any advice on the ordering process
Welcome to the Forum Richard.
One could be mislead by your 'Handle' into thinking that you would only have the best of everything available in terms of specification, extras and specialist add ons.
There are plenty of extras available if you are starting from a Bespoke Order. Just make sure that the Dealer or Factory Sales take you through eveything there is so it can be 'built in' rather than have to have items 'Retro Fitted'
The Roadster 100 was supposed to be top spec but it did not have stainless door checks, amongst other things. Some did not have Radio Arials & Speakers. Some did. Ours came with a Map Light. Others did not. Traditional Side Lights are not fitted now, but can be if requested. etc etc.
I just wonder if anyone has ever produced a Checklist from Basic to 'Bells & Whistles.