Specifications of the rear hub: 

Brand: BQ
Model: BQ-RH30008
Color: Black
Number of spoke holes: 36GTS
Type of brake: Disc (Centerlock)
Number of gears: Micro Spline
Material of the freewheel body:    Steel
Freewheel system:    Pawls (6)
Points of engagement:    36
Type of axle: Thru axle Ø 12 MM
Axle included: No
Type of bearings: Industrial bearings
Average weight (GR): 406
Intended use: E-Bike
 
Data for spoke length calculations using the Sapim spoke size calculator: 
Total length of the hub (MM): 148
Non-gear side (MM): 36
Gear side (MM): 49
Hub diameter non-gear side (MM): 62
Hub diameter gear side (MM): 62
 
Link to spoke calculator: www.sapim.be/spoke-calculator