Background: I am a structural engineer and have a small structural engineering firm. Sometimes, I got the request from clients (steel/concrete sub contractor or contractor) if I can provide shop drawings for the work I design. I have figured it's not a bad business when I could gather few detailers I know (employed as detailers elsewhere) and form another company providing such service.

I searched around for all threads mentioning Shop Drawing Production Services/Business but couldn't find clear answers to my questions:
1. I found that all companies (small or big) that provide this type of services to sub contractors or fabricators are LLC. Is it the standard way to go?
2. When you provide shop drawings which are reviewed & approved by sub contractors, contractors and design professionals (architects and engineers), what liabilities are we looking at? Do contracts between shop drawing service provider and sub contractor or fabricators typically disclaim all liabilities? By the end of the day, shop drawings are not contract documents.
3. What type of insurance policies a shop drawing service provider needs to carry? I've asked my insurance broker and it seems like they don't know much about this and thought this service is providing means & methods of construction and gave me very high estimated quote.
4. Is there any place like Legal Zoom where I can buy contract template for this type of services?

Thank you and any comment would be very appreciated.