I think the question about ligation is moot. You are offering to do engineering to the general public, so you need to be a licensed PE. As such, you are personally liable for errors and omissions, regardless of the company structure.

TTFN (ta ta for now)
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I appreciate your response however, the question is not about litigation but is instead about business structure. Determining the correct structure is essential not only as a means of asset protection but also to minimize the taxes accrued throughout the year. I understand what it means to be a PE and my civil duty to ensure public safety but I am an Engineer who is simply requesting the input from other professionals who have started their own Engineering firm. After further consultation I am likely going to create a Single Member LLC but would still like to know what others have done.

I am also a PE who has started a one man design and 3D printing business. I went with a proprietorship, because I am not designing or selling anything that could cause damages that I could be liable for. I'd say it depends on what you're going to be designing.