There's more to a right-hand-drive to left-hand-drve conversion than just a lhd steering rack. My Mini was imported from England. It was rhd and the builder in England converted to lhd, but didn't do everything that is necessary to make it correct for lhd.
Yes, one can drive it in rhd form and get used to it, but it is nice to be able to jump from one's normal car to the Mini without having to worry how to see around the car you're passing in addition to just trying to be seen and not be hit in the Mini.
To convert from rhd to lhd you need to change: 1. Steering rack - rhd to lhd - and move the steering column over. 2. Brake and clutch master cylinders from right side to left side. 3. Add new hydraulic lines from the brake and clutch master cylinders (now on the left side) to the brake proportioning valve and the slave cylinder. 4. Blank off the holes on the right side where the master cylinders were. 5. Locate and replace the clutch, brake, and accelerator pedal assemblies from rhd to lhd. (The pedals mount in different ways from rhd to lhd. The geometry of the pedal assemblies are different. A rhd pedal assembly mounted in the lhd position places the brake pedal almost directly above the accelerator pedal - not good when you are trying to stop and your foot keeps hitting the gas pedal. 6. Replace the the turn indicator and windshield wiper switches. Depending on the year of your Mini the rhd setup may have the turn indicator switch on the right side of the steering wheel and the wiper switch on the left. Its annoying to hit what you think is the turn indicator and then watch the wipers scrape across a dry windshield. 7. Move the windshield wiper motor assembly from the left side to the right side to get the wipers to sweep from right to left to clear the area in front of the drivers field-of-view. 8. Replace the wiper arms to bend in the correct lhd direction. 9. Move the instrument cluster from the right side to the left side and the related wiring. 10. Replace the speedometer cable with a shorter one as the rhd cable is about a foot to long now. 11. You may want to replace the carpet so the wear pad is on the left, under the driver's feet instead of the passenger's feet. 12. Replace the headlamps with the correctly patterned lamps for lhd.
I may have left something out, but that covers most of the rhd to lhd conversion.
I am 6'1" and I needed to add the seat extensions that are available to make the leg room better. A 6'7" guy would probably need longer extensions made. I didn't care for the steering column lowering bracket. It moved the steering wheel too close to my lap and made me feel cramped.