Casey, that's a good looking build so far, keep it up.
I second your vote for a DM-600 re-issue, I love those offset cabs! I built the Ertl model about 30 years ago, then re-built it the early 1990s. Sadly, I put it, and an AMT Kenworth, in a kitchen cabinet for safe-keeping during a house move, then forgot about both of them! Stoopid.
I recall seeing somewhere that Macks equipped with Maxidyne engines had a gold bulldog hood ornament instead of chrome. Don't know what engine you've got, but I love those little details.
Stuart