Lambretta scooter model

Hi all,
I would really like to print this model, but stl is messed up.
Oryginal file was and skp. I think, that I found on the web long time ago and cannot find any more. I would really like to print this model.
Could anyone, please help me to fix this STL?
I tried meshmixer, F360, netfabb with no joy...

Edit:
After few combined hours of tinkering I have managed to make the model printable.
Also changed the leg shield to reassemble the real one more.
Still far from perfect as my F360 knowledge is next to none and tinkercad is a bit too simple...