Here is another Tender I built, I think it is a B& O prototype. All I remember was seeing the plans & a picture of it in a MR magazine & I fell in love with it! The main tank of this is a piece of Copper water pipe, With .004 sheet copper soldered as an overlay, thats why the big hole you can see inside the coal bunker-- every time it hit it with the torch to solder it, it blew the ends off till I put the hole in it! Durn thing weighs a ton! On the front view , see the two water delivery pipes coming out ? Notice the "Ball" shape on them , the pipes are insulated from the rest of the tender & the wheel pickups feed them & they hook into the loco by a modified split gold bead on the power transfer wire to the motor, it "snaps over the ball. Works real slick & no wire to try to hide! Heres a trick I used to form the ends of the tank. I got 2 of the old "concave or Flat" type freeze plugs for engine blocks, soldered a piece of brass ( on what would be the inside surface) to one freeze plug, put the other over the brass & squeezed them together in a vise ,then heated it enough with a propane torch for the brass to take a set, when they cooled, I trimed & filed the end cap perfectly round using the freeze plug as a pattern.