Hi Sam,
The only condensation we get on walls/floors is in one corner of the master bath. This happens in summer during high humidity. That is the one corner of the house that is most buried. It is insulated etc. We do have to open windows in the summer or the house is too cool.
A carpenter I hired this summer to help me finish what our (former) contractor didn't made a shim for under the outside lip of our aluminum thresholds, then caulked it in place. Seems to work pretty well.
I'll try to shoot some pics today of the swinging doors I made for the 7x9 openings on the shop and barn. You can use what makes sense, admire the carpenter's work and make fun of my mistakes in the trim.
It seems to me that what you want for insurance right now is called Builder's Risk insurance. This covers a construction project against things like theft, damage and liability before people are living there. Your current insurer should be willing to add this as a relatively inexpensive rider to your existing property insurance. If not, try other insurance agents. They don't all follow the same rule book. I'm kind of surprised your agent didn't suggest it.
You may want to consider an umbrella policy. These houses are different and attract attention.
Steve in Maine