Athearn 20K gallon Richmond Tank Car

Here are several photos of Athearns 20K gallon Richmond tank car kit. Tank cars models have come a long way over the past few years and the quality is continuing to improve. Interesting feature on these kits. Notice the bolster end frame units are cast metal. Strength wise, probably a good move. Assembly wise, do parts stay attached? I don't have RTR cars to see how they are holding up.

This car would be a nice companion to Rail Yard Models UTLX sulfuric acid tank car