After many failures and a bit of designer's block, I finally got this done. N Scale Railcar Float Apron/Slip for my Float I made a few months ago. https://www.thingiverse.com/thing:5267663
Great timing! I just finished printing your car float. It took some time to get the code80 rail into the holders, and I broke off a few, but it really looks good. Thanks for your work! Rob Hampton, New Brunswick, Canada