A network for historic guitars and vihuelas
Dear Mr Pearcy,
Baroque guitars mostly come with long scale length (by modern standards), up to 72cm...
But if you want something smaller and historically accurate, you can search for an instrument designed after the Belchior Diaz guitar, a renaissance instrument from 1581 which at some point in the 17th century was turned in a five-course BG. The scale length is about 54cm.
Various luthiers offer this model, for example this one (scroll to the end of the page) :
Hope this helps,
Dear Chris, I don't know if you are still looking, but I know that luthiers Alexander Hopkins, Jan van Cappelle, and Joan Pellisa make small-size five-course guitars (sometimes called guitarró, chitarrino, chitariglio etc.).
If these specific instruments are not found on their website email to te luthier.
There is historical evidence for the existence of short scale guitars in the 17th and 18th century.