I finished the tender this week
The frame is brass with the wheel legs made from steel and CNC cut. They have a ridge around them like the prototype. the wheels are Shapways.
The hardest part of the tender is the upper fairing which tilts out on the side and rear. Looking at a photo of the prototype, I see that it is made in several pieces. I start by cutting card stock for the side and rear profiles and then make the transition piece by cutting out a cone section and trimming it to size. Then using the card stock as a pattern, I cut out the pieces in brass, bend the transition piece to make the cone section and solver solder the pieces together.
The deck is 1/16" flat stock. I have been using .032" sheet stock for my cabs and tenders lately as once it is annealed, it bends easily and the thicker material has less chance of oil-canning when it is heated up. the main body is made of four sections. the rear piece is rivet embossed on the ends and bent to shape around a steel dowel. The sides are rivet embossed on the top and the water legs are bent on a larger dowel. A bulkhead is then made to fit across the fron. Everything is soldered with StayBrite to make it water tight as the fuel tank will be in a water bath here.
I painted it yesterday and decaled it this morning. I am waiting for a battery box for the RC and will install the fuel tank after I mount it.