^ Agree with those who say agreed value is the way to go, which reminds me I need to review my coverage.
One example of a six conversion that sticks out to me is this car—it has a very tame engine, but it was presented well and seemed to check the visual boxes for a lot of people…more so than most modified 914s that come to market.
https://bringatrailer.com/listing/1975-porsche-914-6-gt/
There have been others that went for less, both on BaT and elsewhere.
As to agreed value, the poles would appear to be a realistic price when selling and a realistic price to build another one, if either are desirable scenarios. If mine were gone tomorrow, the replacement might not be a 914, so the price of something that would replace it seems like another marker to consider—and in my case lower than the cost to build another one. Just my .02...