I have yes.the map i am working on is a cemetery with custom models and textures if you have ideas please share or post links to screenies i will add pics of my early work soon
i've decided i'm going to get back into modelling after a few years hiatus
i'm concerned what kind of construction kf2 uses for it's maps, ue3 allows you to make maps entirely using 3d models. i believe the blood system uses vertex colouring to add the blood textures to the world and if thats so i doubt the maps are built using CSG.
perhaps they're using a pixel based mask on a secondary UV like a lightmap uses. i think this is a question that needs answering though because remaking assets for the blood system after the fact would be a pain.
for the time being i'm learning my way around maya, it's not even remotely similar to softimage7