As the title indicates, I've added the sawblades. I've decided to put the example in a video. I don't know if that's a good idea, but the default settings for gif capture clearly weren't working, so.
I've removed the fire tiles for now, which kind of negates the bumpiness entirely, that I've fretted over so. On the other hand, it makes it clearer that going without normal maps is quite a feasible option.
I hate the textures on the sawblades, and the transport mechanism especially, by the way. I was trying to make them muddy, which I've achieved (although not necessarily in the way I wanted). But I don't think the results of my efforts will be appreciable, no matter which angle and perspective I select. And I also realised too late that some of the details would be better modeled rather than painted, which has to do with the fact that I hadn't actually planned for the trasport mechanism and had no concept image for it... At least that's my excuse. Anyway, making a note of it.
Sawblades are looking awesome!