So, I went on a trek to find some accent paint today. Luckily, there's a couple of shops in my area with older paint. Only made it to one, but I think I lucked out on the colours.
For the "red", I've read that some feel that
Floquil Caboose Red was used. They had it in stock, but I wanted to see if they had a water-based acrylic version. Found it. It's
True Line Trains Paint #TLT010002 CP Bright Red (matches the Caboose Red just about perfectly). Down side is that it's a Canadian brand, and it's been discontinued. That said, a couple of places in my area stock it, so it's no big deal to find whatever I need (doubt I'll need more than a bottle or two anyway.) Here's the paint guide for TLT. Hoping my eye was good...
For the "yellow", I'm using
Polly Scale Up Armor Yellow.
For the darker "grey" spots, I think I might go with
Tamiya XF-82 Ocean Gray 2 (RAF). Seems pretty close.
As for the main colour, I'll try the 4 parts Tamiya Flat White to 1 part Tamiya Deck Tan formula.
I used the painting master found in the links in the first post to compare and these were the best I could find.
On another note, this shop also had a couple bottles of Floquil Grime and a bottle of Concrete. I didn't bother picking them up since I know I'd need way more than that to complete this sucka.