Love the dump truck Coop. looks like a great job site workhorse for all seasons.
I also wondered what Cat model to repaint my 4200. Based on undercarriage width of 10" that does suit a 345. Adding to the upper structure will definitely add to the 345 look.
For me, I'm going with a 330B. I've worked on so many of them years ago, only seems appropriate I have one at home to work on again.