This might be the easiest option for you. It looks like you're using it as a scale feature that actually works. I've never used this camera but plenty have.
http://blip.com.au/ There is a place to go look for customer pictures etc.
This camera can be mounted so it's upside down. That will put the main body of the camera down the fuselage and clear of the cockpit area. There are free picture downloads that will allow you to rotate the picture later. You can shift the pix 180 degrees and it will look correct that way.
This camera comes already modified for RC use. You just plug it into a spare channel and "fire when ready". No servo or linkage required.
It is not expensive.
It does not take high end pictures but takes fairly good ones. It is light weight.
Vibration isolation is a different issue and resolving that as well as motion blur are two other issues. Vibration isolation techniques can vary a little depending on your power plant. High frequency low amplitude vibrations are easier to deal with than low frequency high amplitide vibrations. Motion blur is resolved in the pilot to Airplane interface. (Flying styles)
Dan