I'll jump in for the 1:1 size tenders. Here's the cistern we built in the roundhouse at Greenfield Village a few years ago to replace the well worn one that was on our 1873 Mason 0-6-4T. The old tank was probably the second one it had in its lifetime and was installed sometime in the early 1900s. As a result, it had definitely seen better days. The sheets for the new ones were cut and bent at a fabrication shop since we don't have the tools to do that forming easily in our shop, however the frame and the tank itself was assembled by our staff more or less the same way the original would have been. This includes around 2200+ hot rivets that we utilized to hold it together (and all the holes that were drilled/reamed to accept them). There were a couple locations that we had to cheat on and weld, but the majority of it is riveted together just like the original. I will say, we were all quite sore at the end of that project. 
Old meets new
Prior to being sent out for paint.
Finally placed on the locomotive's frame during last winter's cab replacement project.
