Just to be clear, by bumpers, do you mean the green pop bumpers up top, or the slingshots down by the flippers (I ask because some people call the slingshots, bumpers so I'm just making sure)? I could definitely speed them up, but they're currently only moving about 10 positions both down and up. If I go much faster, you might not even see them. There is another possibly though; I had to squish them down a bit in size from the regular mesh and I may not have moved the rings down far enough to compensate. The ring may just be higher than they're supposed to be?
Actually, the majority of time spent lighting things was just learning how to light it. I don't have the artistic talent to apply the proper effects in the right places to make an existing image look properly lit. I do, however, have enough gumption to learn stuff in a program (e.g. Sketchup, Gimp, or Blender), and I have enough just ideas to use that knowledge in appropriate ways.
For example, I had the idea to let Blender light up the plastics from underneath, but I had no idea how to do it. I spent about 6 hours just learning enough about Cycles in Blender (and even then, I couldn't find any tutorials on how to light images from the back), then maybe another hour or so setting up and playing with stuff. Now that I've got that down, all I need is an image with the plastics in the correct positions (like any normal table), another image so I can put the lights in the right places, and then however long it'll take to render out the lit image. Same thing for the GI lighting; just one image to let me know where the lights and posts are, then bake the texture. I may not have things dialed in perfectly yet, but if someone with a discerning/artistic eye could tell me what needs to be done, I know I could do it.
One of the things I live about digital art (CGI, computer assisted animation tweening, etc.) is that it allows people to express themselves, and share with the world something they wouldn't have been able to otherwise, just because they lack the talent or ability to get that idea out of their head. The downside, however, is that it allows people to create works that probably shouldn't have been shared to begin with, and takes away attention from the true artists. I saw someone who made some hand-drawn/traditional style pictures of scenes for Frozen and I personally think it would've been a much more impactful movie if it had not been CGI.