Here's some pics of what is now passing as a c:a 100ys old German kids' bass, about a smallish 5/8 instrument. I thought it was cute, so I had it restored. It sounds nice, although of course is doesn't rattle your guts like a big, proper bass do. Worth the money? Nah. But it makes people talk in a way my much more flamboyant Pöllmann doesn't, plus, you can carry it around like a bass guitar (oh, the wonder!).
Here's what the luthier did, copied and pasted from her mail:
Take off table
3 straight edges
1/2 edge bottom block
diverse gluing
remove back braces
glue cracks, reiforce
new back braces
glue ribs to blocks where they have come away
redo rib repair upper treble
neck graft
retouch
bridge
sound post
regraduate table, remove integral bass rod
new bass rod
And no, that's not me on that pic.