I've just been going through the player's guide and GMs' guide and realised that I passed an important milestone last night without realising. The Investigator's Guide (Player handbook) is... done!
The rest appears to be all the spells, the remaining vehicles and hundreds of NPCs/monsters from the GM book. There are a few niggly bugs to fix elsewhere that I'll target tonight/tomorrow, so if anyone wants to have a play with it, drop me a PM and I'll send out a link at the weekend