Is Tanya asking for turn key costs? I'll assume so and throw out a couple impressions I have. Certainly "It depends" is the standard answer?
Real tough to build for $100/sqft these days - $125-150 more reasonable for a "good" house. Building for less requires wholesale purchasing and/or lots of donated labor (hence $61).
Timber frame probably adds 25%, but with good early design and certain options it can be a lot less than that. Custom log is even more, log kit is less. Log is an apples-to-oranges comparison since they won't meet energy standards among other problems.
I estimate 60% of final cost is "shell" (including frame & panels) and can't be moved much. The remainder is inside and where budgets are made or blown. Kitchen or flooring or tile or stone is what raises the final number more than anything else.
I maintain anyone can have a timber frame if they really want one. Trade off some space requirement or disposable trim and you can do it. Invest in design to save money later. A big topic, sorry to ramble on.
