I realize you have a long haul to the mainland, and it won't be cheap. That being said, over the years, I have spent a fair amount of money on plane tickets, hotels, and rental cars to inspect every GTX (seven total) I ever purchased. I rejected one car after inspection (the only one of the group offered by a dealer,) condition didn't justify the price. It later sold for what I offered, 15K under the initial ask. Ended up buying the others, and never had regrets with any of them.
You can't trust pictures. My fifth GTX is currently for sale in Hemmings, with a professional photo spread. The car is extremely nice, but like most, has small flaws which don't show in any of the photographs. I like belt and suspenders on a big purchase, because of the emotional factor mentioned in an earlier post. When I bought my Hemi car, I took a friend who was a Ford expert to verify body and mechanical condition, while I did the numbers matching due diligence. He acted as a check and balance to my emotional attachment.
The independent inspection is a really good idea when considering your travel expense. But if you are dealing with a high dollar car, I personally would overkill, and still pay travel expense to view it in person before I parted with my funds.