I just finished all the cylinders on my doors, wasn't terrible to put them in. The big rear main door would be tough to put a servo... they make a little cutout just for a cylinder.
I was going to use linear servos, but Phil Noel, who has done of few of these planes, advised against it. The firgelli are too big and square, the electrons work, but they aren't proportional... no idea why. These are the ones Phil suggested not to use. Trust his opinion.