This instrument was updated a year ago and I made plans available, these are some pictures of one made of English plantation grown Poplar wood. Note I have borrowed the construction technique from the Nyckelharpa here!
Note in this picture the ledge for the soundboard and its slight arc, this is mainly done by cutting out the wood either side of the centre section :
Here is the soundboard after its first "fit" it is temporary glued with animal glue and then location pins drilled and it is carefully removed, holes marked and then cut and a bass bar added:
To be continued.......
for plans see here:https://payhip.com/lyreshop