Box for Corona R6FA and Backpack M2

This is a box to be mounted on a backpack M2 used with paraglider Opale Hybrid 1.8
http://www.opale-paramodels.com/index.php/fr/shop/rc-paramotor-frames/backpack-m2/backpack-m2-detail
The box is done for receiver Corona R6FA (48x27x12mm)
2 small tubes of 3mm are added for the antenna