If you’re comsidering a kit home, then possibly also consider a transportable. Your story sounds quite similar to my own. I built a beach house in a town called Robe in SA. I considered local builders, regional or nearby, and also the kit home option (constructed by a local). But when I looked into the advantages of a transportable for my type of project there was no comparison.
First was the financial benefit. You put down a minimal deposit. In my case it was $2k on a $133k house delivered. Because the bank won’t secure a loan against a house that is not “fixed” at the property, the builder assumes all the risk until the house is delivered and fixed into the footings (which a good company will also manage with a local trade). You then pay a lump sum at settlement on the day of delivery. This had specific benefits in managing thr cash flow and also meant that I could time the liability of the debt to coincide with the holiday rental season income.
The second was risk management. It avoided the risk of stage payments on a project that I live far from and couldnt supervise. It meant that the risk of unmanagable time delays from builders/trades was eliminated. As this was the first time I had done something like this, eliminating these risks as an unknown was a relief.
Third was that the electrical and plumbing aspects of the project were self contained and very manageable by you from a distance. The key was getting the individuals that you could trust. The rest flowed seamlessly.
Fourth would be the warranty. Given that the house was built, delivered and installed to site by a single company, all the standard warranty periods apply. If you owner build, then you no doubt encounter potential uncertainty with that.
Finally, there is also plenty of flexibility in design. I was able to fit 4 bedrooms, 3 bathrooms, kitchen dining and living into a 20m x 6.9m rectangle, and it is exceptionally comfortable. It was delivered on the back of a semi into a tight location. I was in awe of the crew that did the delivery. They seem to go around in teams and just hit the job with seamless expertise.
You can tell from the street that it’s a transportable because it sits 600mm higher than the neighbouring houses which are built on slabs. But I dont care.