One way to find businesses that can help you is to go to the timber framers guild home page and click on 'resource guide'. Then enter the state of the house "MI" or Michigan and then restoration as the category. This search listed one company. You could try them.
Another way to find companies that can help you is to go to the timber framers business council’s home page and ask them for help finding companies that can help you. Their site is at www.timberframe.org Good luck with your project. Jim