As you can see, the inside surface of the lute body is clean, and I can now glue reinforcing strips along the seams.
I have cut the strips from medium weight rag/cotton paper: that is the traditional method. I don’t see any particular merit in changing something that has lasted the distance.
Many contemporary makers prefer to use modern material – but I recall the comment of a famous luthier, now departed:
“The way a lute is made affects the quality of the sound”.