ETA: 9.5.18  Added an STL for a battery strap hold down thing for those that prefer a strap to straight velcro.
ETA: 8.15.18 Added Simplify3D factory files for all parts except the firewall for PLA.  Also did the same with preconfigured G-Codes for i3 style printers.  The firewall really needs to be printed with a material other than PLA.  PETG, ABS, ASA, Polycarbonate, Nylon would all be much better choices.
ETA:  8.14.18  Cura Profiles for PLA and PETG are now uploaded.  They're simple, but contain my optimal settings.  Will likely need tuning to match your machine and filament, but they will allow the inner ribs and supports to be sliced.
ETA 8.13.18:  Added Simplify3D Factory files for all parts in PETG, as well as preconfigured PETG gcode files for i3 style printers for all parts.
1st off, yes, the whole plane and all the files are available for free.  However, if you want to leave a tip, I'd be grateful.  This thing was a lot of work.  Thanks!
I know this is a long bit of text, but unless you're familiar…