ROM Hack Problems with creating a MK7 custom course

[smileyhead]

I've tried asking Pablo about this, but after no answer for almost a month, I'm asking you guys for help.
The model is finished, but not all of the Materials get recongised in EFE's Collision Creator.

Here's the list of Materials used in the model:

Spoiler

black
blue
boost_pad
grass
grass_oob
grey
road
road_dark
silver
underwater_offroad
underwater_oob
underwater_wall
water
yellow_road
yellow_wall
yellow_wall_underwater

And here's everything displayed in EFE (note how not all of them are even actual Materials, it even lists some imported PNGs):

Spoiler

grass
grass_oob
FrontColor (I have no idea what this even is)
yellow_wall
black
grey
mktv (just a PNG, not a Material)
finish_line (ditto)