I'm glad to see that you are enjoy seeing some of the machinery here on Kauai.
Most of the show class cars here were put together on the Mainland then brought over. The guys tell me that once a car has done the round of shows there in their home areas for a year or so. Then they go up for sale. And the guys here shop for cool cars to bring home to show here.
A few of the guys here do complete restos here, and yes it is difficult and expensive to do here. But for some its the doing the project that is the fun.
Alex, I've been checking the calender of events happening when you are here, have yet to find any car events on tap. I'll keep it in mind and let you know if anything interesting comes up. There is a Slack Key Guitar fest. happening near the end of your stay, if that is of interest. Looking like our condo will be available for that one night you are looking to fill at the end of your stay. I'll PM you about that. I'm hoping we can get out for some cruising in my targa while you are here. Hard to say about the weather that far out, good thing you are not here this week. Mostly cloudy and rainy now.
Zeke, Were you referring to the white bubble top in the right of this pic? Sorry, can't find any other pics.

If so it is a regular at shows here, and is very nice.
The local car scene continues to surprise me. Went to the Drag Races last summer and was really surprised at how deeply into the sport some families here are. Multi generations putting together cars that would do well anywhere. In some cases a number of cars in the same families. Quite a few Hot V Ws Some old bugs that could have embarrassed my SC pretty easily. Right on up to Fuel Funny cars, and Fuel Dragsters. Most of these team are from Kauai, but some came over from Oahu ( the track there is closed) and the other islands.
All in all the the love of cool cars is alive and well in the islands. Its easy to miss just driving around cause you just don't see many out and about. Not sure why, It is very salty here and muddy/dirty at times too.
I say drive'm if you have'm. But that's just me :-)
Richard