Nicely done! I've mounted cameras on the horizontal before and ended up with too much vibration. Impressed that yours is so smooth. Did you do any editing work??
As for airflow disruption, I've mounted cameras (with some obnoxiously large mounts for DV camcorders, etc.) on the top & bottom of the wings, belly, canopy, forward fuselage, vertical stab, horiz stab, and had no issue other than added drag and some yawing effect (wing mounts). Doesn't mean go be crazy with the external devices and not thinking first. But RVs are not terribly sensitive in my experience to use of external attachments of this type.