East Coast Defender sources Land Rover D90s and 110s worldwide is ready to rebuild them by your requirements, with special installments from an LS3 V8 to a 2.8 liter Cummins under the flat hood, but in case you want we guess you already realized it’s going to cost you a fortune.
Raised in the Midlands, the heart of British car country, brothers Tom and Elliot Humble grew up with Land Rovers made nearby. They both studied sports exercise but left school to follow their enthusiast calling and now manage the ECD custom-resto Defender shop just a stone's throw from Disney World in Florida.
Their approach is somewhat analogous to what Singer does with the Porsche 911. ECD competes with other Land Rover restorers and importers (including LA-based West Coast Defender) to find Defenders of a certain age – including North American models originally sold here – import and document them as needed to be registered street-legal in Florida, and then build them to spec. Having one built to meet standards in a specific state outside Florida isn't a problem, though due diligence on your part about regulations like those concerning lighting is a good idea.