Beautiful, Melvin, and I am sure it sounds great!
Ok, I will expand, but unfortunately (or fortunately!) I don't have pictures of the finished (D-)violone, because it left the workshop before the strings stayed in tune, but after having tied the frets. It will come back in a week or two for an adjustment, and I will take some more pictures.
The thickest string, the low D (34,62Hz) has a diameter of 6mmm, and I am glad it responds easily with almost no bow pressure. Great strings, but still a little smelly.
This is a reconstruction of an instrument by G.P. Maggini, the original (in the Museo Santa Giulia, Brescia) has been transformed into a modern doublebass with only 4 strings, unfortunately.
Some more pictures of the unfinished instrument: