Making a calender is a great idea but also quite expensive undertaking.
Do your homework folks if you venture into this little project but also be aware of the legalities behind posting any-one's photo. I do some sports Internet work and you wouldn't believe the hoops or open ends that can hit you. Any royalties is also open to collection from the person in the photo unless you have complete waiver releases signed off.
The next part now, if such a calender comes to life I have an idea for money's that may come from it. Racing guy's are not immune to what is sweeping this globe financially so maybe helping out any forum members who are hitting hard times should be considered.
Peace.