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This is a generic HOn3 tender floor to use under my generic HOn3 tender tank. It's part of my 4-6-0 roject, but would work behind a 2-8-0 or other HOn3 locomotive. Dimensions are 76.40mm x 29.20mm, or in HO scale 21'10" x 8'4". It will print in Detail Plastic, Veratile Plastic, or Professional plastic. I increased the dimensions of the steps so hopefully they will print OK in versatile plastic. I printed it in white versatile for strength and to save money, but it equired sanding and filing to get the finish smooth. Detail plastic is more brittle, and the steps may break.
Depending on which couplers you use, you will probably need to shim under the coupler pad to get the coupler to the correct height. I put a pair of MDC trucks under mine, but depending on what trucks you use, you may also need to put shims between the trucks and the bolsters to keep the wheels from interfering with the underframe.