I have to agree with MacD about the colors. I worked in a water ski factory for 5 years. If it was one color scheme I was sick of seeing it was the loud garish colors they paint machinery. Bright yellow, orange, grey, green, powder blue. They tend to paint the different systems of machiery different colors. Pumps tend to be different colors from the main pieces. Hoses for certain sets of sub systems are the same color, blue for cooling, red for exhaust, yellow for injection and so on. Just to make fixing the machines easier. Is the machine not injecting plastic? easy to fix, just check all the yellow hoses.
Sure we natually expect game art machinery to be flat and just blend into the background. You might have gone a bit over board but it really depends on the type of machine it is. If it isn't modeled after a real world piece of machinery you might want to tone down the colors a bit and rethink the color layout. They just don't paint the parts willy nilly with whatever color they have on hand. There is often some kind of logic to it. Right now, I can't understand the color scheme on the lower right pic. It is kind of crazy. The other pics make sense and look fine.
Personally I think you should put smash guards next to those computer screens. Some concrete posts or heavy duty plasitc half corners that bolt to the ground and take damage instead of letting the machinery get bashed. Even careful forlift operators smash into the corners of expensive machines. Companies always toss out 50 bucks for the guards rather than the thousands they lose in repairs and down time.
Access hatches and latches. Since it looks like this machine has an outer casing that hides alot of the inner working parts you need ways to open it up and get inside for cleaning and repairs. If the casing is heavy enough it might need hydrolic pistons to help lift and hold it up.
Also plan out what would be a common place for scratches and damage. Along the side, and front would make sense. Also around the opening where it looks like parts would be coming and going. Not so much on top, unless parts are being set ontop?
Also putting some warning colors or a plastic finger guard over the opening might help, since they tend to do that when machinery that can rip your limbs off.