Here's the updated version:

Added a lot more detail and reworked some of the earlier shapes. I also made the visor a tad thinner and changed the angles a little in order to make him more sinister. The visor color has also been changed to something a little more yellow/gold, like the original toy. I think it's a bit better than the garrish red. The eyes are also much clearer in this version. Again, I don't plan on doing any visorless and nonface plate versions, so I hope seeing the eyes through the visor is enough. Soundwave is a "I wear my unglasses at night" kind of character.
I may give this one more round of minor tweaks, but this it pretty much, I think.
Thanks for taking a look and for any thoughts you might like to share.