I completed my PhD in 2011 at the London Metropolitan University, with my thesis called:
The Baroque Bassoon: form, construction, acoustics, and playing qualities
If you would like to read more about baroque bassoon designs, or just look at a lot of pictures (and graphs!) of lovely original instruments, interesting iconography, etc, you can download a pdf copy free from the British Library EThOS site HERE (you will need to make an account but it is entirely free).
To read more about the Poerschman bassoons and my recontruction, see my article:
Designing a Reconstruction, or Reconstructing the Design. The Bassoons of Johann Poerschman
Again entirely free, alongside many other interesting articles on historical bassoons and the reconstructing of them, in this download of the publication:
For my argument for a categorisation of the designs of baroque bassoons into 2 Types and 5 subtypes, see my article
Baroque bassoon designs: a suggested typology
This is also discussed in my thesis but is more succcinct here, again along with many interesting bassoon-related articles (in German and English) in the recently published proceedings of the 2015 conference at Kloster Michaelstein:
Further publications to be listed...