Similar to your project, I have been thinking of reading the following Golden Age of Mystery authors in publication order. All together, year by year.
<snip author list>
And then write a quick blog post about each one as I go... It would be interesting to see how a) technology progresses in the novels and b) how major geo-political events impact each novel. For example, my sense is post WWII, many of series got a bit darker in feel.
I'd certainly be interested in reading the non-spoilery parts! Do you have a favorite that you've started reading? (A friend loves Ngaio Marsh, so I might do her next).
For Wolfe, I'm up to 1953 right now reading consecutively, and have read five more random ones up to 1965. I haven't noticed them being darker as it's gone, but the technology has definitely changed - and is particularly noticeable in "The Doorbell Rang" in 1965. Geopolitics has popped up a few times along the way.
I've been tempted to order the cookbook. And, if the Greenbrier were cheaper, might think about that for a vacation based on it inspiring the resort in one of the books where cooking was a big part of the set-up.