...tuned in c-g-d-a-e have been built from ca. 1730 onwards particularly in France and Germany. They were also known as „dessus de viole" , „viola pomposa", „violetta" or „violino pomposo".

Around 1800 frenchman M.Woldemar build a five-string viola, named „violon alto", with which it was much easier to play soloparts of violaliterature of that time. As well did N.Chappuy in Mirecourt around 1740. His quinton was tuned diverse: g-d-a-d-g .Thus the violin players avoided to change positions. Shape and body-length have been more or less that of the violin.

With regard to modern demand of sound volume and carrying capacity I developed a body-shape that combines sufficient corpus volume with the space necessary for any bow movement.
I build quintones in violin mensur in four corpus lengths: 355, 360, 365 and 370 mm. The smaller models have a sound as brillant as the violin while the bigger ones rather sound like a viola.
The viola models are 390 and 410 mm long (vibrating string length from 360 up to 375mm possible).

I use to make the top (belly) basically in two techniques:

a) carved arching out of a massive but joined piece of 10-years stored spruce from the alps ( as it is usual in modern-classical violinmaking).
b) bent arching (with the help of moderate water steam, clamps and wedges; early baroque building technique). Thus the longitudinal cells of the spruce (trachees) remain entire over all the length of the top.

Of course I will drop your sound ideas and individual wishes in the making of each single instrument!