The shrink wrap method will work fine if prepared properly. Other options I didn't see mentioned here are using side mount servos I think JR 3321 has a side mount and Airtronics has one as well.

Also, BVM and others sell side mounts which look like an "L". This allows you to mount standard size servos in a tight space.

I've used all of the above with great success.

Happy mounting,

Mark