Hi Guillermo,
Back in 2007, a student of mine, Andreas Zingerle, tried the "half-can" pinhole camera. You can see the results here:https://gebseng.com/media_archeology/student_works/2007/Andreas%20Zingerle%20-%20Solargrafica/neoanalog_pinhole%20andreas%20zingerle.pdf
best, geb