What are the exact dimensions of Silverstone?

I’m trying to create a model of Silverstone and need the exact dimensions of the track. I need the lengths of everything and the angles and sizes of every corner. Does anybody know where this can be found?

I have tried using Google Maps and measuring the distances using the measure tool, however my measurements are always out by a bit. I want to know if there is any website or if anyone knows all the dimensions for the track.