Yup. A cockpit 3d model only takes a couple of months to build, research of all the avionics and other features a few more months, and programming of all the instruments and a realistic flight envelope only about 3-4 months.
With LOCK-ON's 46 AI only aircraft, that's only about 30 extra years of work, in addition to 4-5 years already spent on the 8 flyables.