I'm sorry to announce you that I'm giving up from GPL MiG-21bis project. Developing solo isn't something I could recomend you, even with the great template like mr. David Culp's MiG-21MF. Biggest trouble was with instruments (really not my speciality). If someone is interested to continue with development or to use this 3D model you're welcome...
Issues with current package:
1. FDM error, rudder can't turn to the left - common with original Mig-21MF
2. Weapon system doesn't work - common with original Mig-21MF
3. Heading indicator doesn't work (generic instrument used)