You can plant 24 and strip 12, and still be in the same tracks, it just makes things a little more complicated when starting or finishing a field.  

As far as ideal width, well 16 rows/ 40' would be ideal in terms of ratio of trafficked : untrafficked soil.  But that means a heavier combine, and would be practically impossible without tracks (which restricts you to owning a Lexion combine, since nothing else will go down to 120" on tracks).  And using a grain cart.   12 rows/30' is probably the simplest way to go, and you can still plant 24 rows so planting capacity is not too much of an issue.  Problem with CTF is even though you concentrate compaction to traffic lanes, it doesn't mean you shouldn't be careful.  Heavy carts and combines will cause rutting and ultimately lots of trouble.  I would get as small as possible of a grain cart, max 1000 bu on tracks...  if you want to turn around, set a traffic alley halfway into the field and always turn there.  Having everything on tracks would probably be the best bet to have tramlines that last... and planting them with raygrass would probably help too.  

Main issue with CTF is it takes a lot of discipline.  Ridge till guys were forced to have that discipline because of the present of ridges.  But otherwise it's just too easy to decide to turn around in the middle of the field, or harvest beans at an angle, etc.  Very very few farmers have that discipline.