Frsky X4R-SB case

Hi,

Here's case for Frsky X4R-SB, which fits on Diatone ET160. Can be stacked also over Naze32 or other FC's with screw holes on 30,5mm pitch. 8mm M3 stand off's or normal M3 nuts can be used for fixing.

Added another print also, in case longer screws are used to stack other stuff over the case.