If you have watched David Windestal build his Tricopter scratch build V2.6HV at flitetest, you will have noticed the battery holder he created using laser cut 1/16" pinewood pieces. He is awesome.
Since I don't have a laser cutter, I just designed the replacement parts to be printed in plastic. I plan to use a 1/8" pinewood rectangular plank for my tricopter as it is very inexpensive compared to printing it out whole. Wire mount point might be on the bottom of the pinewood.
I also included the openscad files so others can improve the design and upload their versions.
Added the versions for King Cobra tricopter base.
Changed the hole location of the bottom battery holder for King Cobra tricopter base. This accommodates the base size reduction from the previous version.