Very cool, completely forgot about this. Just took a look at it and it really seem to be THE ultimate guide to this engine, hope it will be useful for people wanting to start developing with RGM :) That car park hidden door is a funny idea by the way, love to see unusual ideas like this!
I just noted the texts under figure 93 - 101 see to be wrong, it's always "Hellwomb" and "Cornflakestein", but they clearly show other stuff.