Flexicoil Truck for the EMD SW1500

The Nasa EMD SW1500 Switcher I want to use to build my Nasa train has Flexicoil Trucks. Barspin's model (http://www.thingiverse.com/thing:916416) is provided with Type A trucks.
So I've designed new trucks (actually just the side frames). I've added slightly bigger wheels to match the size of the ones used on the actual SW1500.