One of the members of Delcamp forum recently posted his video and arrangement to download of this nice piece. He transposed it to E minor and uses a capo on the 3rd fret. It occurred to me that it could be played on the alto guitar as is, no capo.
Here's a link to Bert Alink's website, where you can both watch his video and download his arrangement.
Here is a YouTube video of Kaare Norge playing the same piece in G minor, presumably also reading it in E minor but with a capo on the 3rd fret.