I know what you mean about the cost of any auxiliary tender. I've got a MTH RK N&W Y6B and I wanted to add and Aux Tender. Costs were way to prohibitive. I wound up using a tender like the ones that came with the starter set 4-4-2s from the 80s to make one. I think our LEGO tender looks pretty good. A union Pacific decal on the side will make it blend even better. Looks like it sits a little high in the video. Does it actually sit high or does the bottom contour combined with the fact it is a little narrow give it that high appearance?