Drats!
"There is no legal pathway in Michigan for a private individual to have their head removed, the flesh stripped, and the skull preserved for personal/family keepsake purposes.
While the idea feels personal and intimate to you, it is currently illegal in Michigan and most other states. The law treats the body with certain protections even after death, and deliberate mutilation (especially something as extreme as beheading and flaying) is not permitted for sentimental reasons."