From 5 years ago, another pioneer for the thread:
Paul Castaibert was an Argentinean of French origin who also became a well recognized aviation pioneer. From 1911 to 1918 he developed a prolific line of airplanes for Argentina and Uruguay. These machines followed the design general lines of European counterparts, but adapted and refined, many times using great ingenuity to solve construction challenges and having innovative devices built into them.
The model presented here is a two-place trainer variant of the Castaibert IV.
The plans I found were not accurate compared with photos, so some corrections had to be made before scratchbuilding began.