It is not at all that uncommon for a company to have a L.O.A from the FAA stating that you can have a trained and checked SIC logging time in a Single Pilot Aircraft. The smallest one that we have on that program is a Navajo. Make sure that the company has a current L.O.A on file though because I know of some companies that stated you can build time with them doing the SIC thing and it turned out that they did not have approval for the program.