Yes but not recommended
As I recall there is enough wprk to be done fitting and installing the tail feathers that you need good visibility into that area without the cowlings in the way. The reverse is true when you fit and fiddle with the cowlings. Doable but a pain with the stabilator in place. Might as well get good at removing and installing all of those items.
BTW, you have the upgraded Trim Actuator installed I hope.
First Flight 9/23/16!
No paint yet. Working on a scheme with John Deere colors or accents.