I did the very same thing last year. Mine is converted, but not finished. I'm not sure they are ever finished. I am in Ohio and here is what I did (after many phone calls and headaches):
1) got commercial insurance till I got the minimum requirements for a re-title
2) The requirements here are bed, cooking, refrigeration, and toilet. (if I remember correct)
3) went to registrar and filled out some paperwork to get it re-titled as a motorhome.
4) called insurance company and changed to RV insurance. I have full coverage for less than commercial liability.
I used State Farm Insurance.
I just did what you are looking for, so if you have any questions for me, go ahead and contact me. I most of my answers here. These guys know there stuff.
Doc Weaver '98 Freightliner FL60 pseudo toy hauler