Hi Steph,
I will PM you the email address of the Capel St May + Little and Great Wenham Local History Recorder*, she may be able to tell you more.
Wenham Hall was anciently the seat of the Brews/Brewse family, followed by the Thurston family. It is in Little Wenham.
In the book, 'Suffolk Houses - a study of domestic architecture' there is a section on the Hall, including an aerial view and supposition of what the hall floor plan was originally.
The book is by Eric Sandon with drawings by John Western, and I just checked a well know supplier of books on-line A***** and several are available - the book has been reprinted in recent years. You may of course be able to obtain an inter-library copy.
Pat ...
Recorders' Secretary - Suffolk Local History Council