We looked at log homes and homes built with 6x6s(long story on that design) but in then end, after talking to people and investigating these construction methods, decided to build stick built. We also look long and hard at ICF.
Log homes have issues with settling/shrinkage, bugs, rot, and were more expensive to build when we making decisions. I even read of a case, where the log home was put up during the week, and was stolen over the weekend.

Never would have thought that would happen and it certainly is unusual.
As others have said, if the contractor wants out because of money issues OR he has a more profitable house to build, do you really want him building your house?
I would not want to be building or buying a home right now. Too much uncertainty and high prices for materials and workers.
We know of a house sale where the buyers AND sellers have gotten themselves into a real bad situation. The buyers have a good lock on an interest rate but the lock has run out and they are paying the bank money they cannot afford to keep the rate. Each day they pay quite a bit money When the house inspection was done, quite a few problems were found, which was surprising, and these are going to be expensive to fix so the house price was renegotiated. The buyers WANT the house for a variety of reasons but a major one is the low interest rate. If they don't get the house, they will have a much higher rate and they will have to buy a much smaller home as a result. The seller is shafted because of equity debt(Long HORROR show that would shock TBNers) that they don't have the cash or equity to FIX the problems found in the inspection. The sellers will have to disclose the problems to future buyers if the sale falls through and the seller has to sell because of raising interest rates on the equity loan. If it was me, I would run from the sale based on some of the problems found in the inspection. The builder should be hung for what he did and I am shocked the house passed inspections. The current buyers are willing to deal with the problems because of the interest rate lock..... It is a vicious circle the buyer and seller are locked into.
Later,
Dan