FRSky Taranis Plus Battery Cover and Aux

Interested by the battery box design of totof1965 (http://www.thingiverse.com/thing:252542) I decided to print one for my Taranis Plus. The problem was that the bottom lip was not high enough to clear the battery I was using, a Nano-Tech 2.1 LIFE, this measures 100mm x 30mm x 30mm. So I set about designing my own cover. This is the first file, the flat cover.
After this I was musing on how to mount the small LIPO battery I had for running my FPV DVR 7" screen. Out of interest the battery is Tu