FT Battery Tray

This is inspired by the [FT Elements battery tray](http://store.flitetest.com/ft-elements-battery-camera-mount/). It was designed to fit the slots in the Sea Duck plans. I assume it will fit wherever the FT Elements tray is called for.

Length: 126mm
Width: 65mm
Thickness: 2mm
Weight: 16g

The original version only supports fairly narrow battery straps. The "big slots" version of the STL file will accept [3/4" battery straps](http://www.banggood.com/5-PCS-Eachine-Battey-Tie-Down-Strap-22