are the contours hard to mount?
Like Tom said they are very easy to mount. Most of the handlebar mounts work for a barrel (although I have gotten one that was too large a diameter to get tight against the barrel without some foam tape to close it up a little more).
With any action camera getting on the mask can be a little trickier but with enough thought and time you can find someway to get it on.
That looks great .
What camera did you use
Mask Cam- Contour ROAM2
Barrel Cam- Contour Plus w/ Ragecam 12mm Zoom Lens Installed
Also this video was pretty much raw footage. I didn't zoom in any further or add any effects, stabilization, or adjust the setting in any way. I just edited for content so what you are seeing is what you would get with the same setup.
Check out his YouTube channel for lots of information on how he does this
Thanks for getting questions answered in my absence!