A realistic small navy for independent Catalonia

What kind of navy could independent Catalonia field during the Spanish Civil War era?

Mostly coastal gunboats and motor torpedo boats, with a larger presence sloop and perhaps two to four small submarines.

The proposed force begins with affordable craft suited to Catalonia's limited territory and immediate coastal-defense needs. Motor torpedo boats and gunboats provide local striking power without requiring a large fleet infrastructure. One larger sloop could show the flag and support overseas presence, while two to four Type II-sized submarines represent the upper end of ambition. This compact force matches its missions to the state's industrial scale.