I'm getting more intrigued every time I look at the Peter Berry Sr rifle in "Art and Evolution", anybody built one or have any pics? Berry's in the archives would seem to be Jr, not Sr. Interestingly different stock lines on the gun (p24 in the book) although I'm not hot on patchboxes that drop into the lower moulding.
Long way off, several other things in the pipeline, just thinking out loud...