Do one side at a time and get it working and set right up and down before doing the other side. I have several planes with mechanicals. They work great when set up right. Those photos looks good too. Thes servos are not proportional. Cannot adjust the travel at all, strictly 180 degrees off.

Also take into consideration the rods you use. In the last few years I use 4-40 now because thinner rods can bow out. More stable this way.

Hey, Ken, fair out okay?