The Trubia tank on this website is one of the few tanks built in Spain. There's an article on the tank on Landships II (
Landships II) as well as a download of the Trubia model. The Trubia model was designed by Pablo Martin.
The Trubia tank didn't make it to production but a related design the Trubia Naval was produced in small numbers during the Spanish Civil War. I think Sergey Kamotsky (
https://vk.com/robototehnikpaper) has a model of the Trubia Naval.
Regards,
Charlie