The kit was produced by Portland Locomotive Works, they have a Yahoo Group for those interested. I got the kit for Christmas in 2016 and finished it recently. Here's the progression.
Started with the frame. Typical flatcar frame, easy going.
Next, I added the deck. Two things quickly became apparent. First, the end blocks were too far from the ends of the tank and the tank didn't sit well in the curved blocks.
I fabricated the straps out of styrene and brass wire with some NBW castings.
Then came the tank handlebar mounts. WOW! How in the world was I supposed to cut these off the 3D printing? The instructions suggested the use of a Dremel tool, which resulted in a 75% failure rate. Luckily, a quick email to Gary at Portland resulted in an extra set, no charge (Thanks Gary!). The next time I used a small wire saw and only managed to brake one!