Today I have managed to add machines to the level layout. The machines are the producers of the crates in the level, as seen in the video of the 2D version with cute smiley faces on top and flashing lights for a nose.
The new version still has flashing lights for noses, and hopefully at some point i will get around to adding point lights as part of the effect. In the new 3D version i have decided to give the lights square edges so that they can rotate, the movement will hopefully draw some attention.
Technically, this is implemented by grouping together related models (e.g. the light and its machine) into a class called BoxCollection which holds a std::vector of Box objects ("box" being the internal name for a model in the game).
Comments as always are welcome