The direction of rotation is determined by which side you attach the tiltrotor to, right side should be correct iirc. The ducted fans have a orange and a red spinner, the red one pointing backwards. Might not be ideal for colorblind people, but you can easily recolor that part of the texture to a more easily differentiated color (blue maybe?). Seen some weirdness with surface attached things, weirdly enough hitting restart flight seem to make the joints rock solid.