Richard - there could be things that aren't obvious that need changing, like the engine could be slightly offset to the left in your RHD and that might need changing, and yes there are custom footboxes that would probably need to be fabricated or moulded.
Bodywork changes for the roll bar?
Any likelyhood - however remote - you would be going back to UK?
Keep it as a RHD. Cheers!
Glen