Specifications of the rear hub: 

Brand: BQ
Model: BQ-RH30006
Color: Black
Number of spoke holes: 36GTS
Type of brake: Rim brake
Number of gears: HG Body 36.85 MM (HG 11) = suitable for all cassettes (possibly with the use of spacer(s))
Material of the freewheel body:    Steel
Type of axle: Drop axle
Axle included: Yes, quick release
Type of bearings: Industrial bearings
Average weight (GR): 386
Intended use: Race
 
Data for spoke length calculations using the Sapim spoke size calculator: 
Total length of the hub (MM): 130
Non-gear side (MM): 25
Gear side (MM): 47
Hub diameter non-gear side (MM): 45
Hub diameter gear side (MM): 45
 
Link to spoke calculator: www.sapim.be/spoke-calculator