My experience with my cross-country road trips on the issues raised by Dave T. are as follows:
1. Most auto insurance policies in the US cover the policyholder for 30 days after purchase of another vehicle, and this is w/o an advance notice requirement.
2. When purchasing a vehicle away from your home state, my experience is that if purchased from a dealer, they will put a temporary plate on it. For an individual, simply have them sign the title over to you and register it with your local department of motor vehicles. This, by the way, is where you will pay sales tax unless you live in a state w no sales tax (lucky bugger!).
3. Line up a few service/repair centers along your route home, and try to find some owners (via Lotus Chat) along that route. OP has already started w/ this.
4. Research LotusChat posts for problems common with your model. Having said that, the only cross-country issue I've had w/ a new/old car was one window in a Europa wouldn't go down.
5. Bad weather? Lotuses are made in England where it rains all the time!
Have fun, and write up your adventure!