I am liking the styrene myself. It is forcing me to be disciplined and take my time. My unimog will take a while, much slower than your build. I just can't wait to be out of an apartment and have real build space for my projects.
Your build is looking mighty fine Chip, and your avatar always makes me laugh!
I have been working on some aluminum body panels so when it smashes into a rock I get dents. ;-) The chassis kit comes with lexan body panels which would be very easy to paint and pull the over spray film off.