I too finally received a copy of this book (thanks Santa! :-)) Format-wise I was pleased to note that it sits very nicely alongside the
anniversary edition of Crabe from 2021, with the same style spine and binding. However, both volumes are slightly too big for my Tintin rocket book spinner! Not a deal-breaker, however...
I concur with most of RedVictory356's points. The 14-page preface is most welcome (and double that of the recent
Crabe 80th anniversary book). I love the first attempts at a cover. The original plan was to have Haddock in his wheelchair pushed by Castafiore, with Tintin and Calculus in the background looking on and a paparazzi photographer snapping photos. There's a rough sketch of this idea and then a more detailed one which includes a couple more characters. Tintin seems to be talking with Wagner (I believe), although it might be a journalist. Calculus is also talking to another reporter. In the background you can see the 'villains' peeking over the Marlinspike wall.
I think it would have been quite a hilarious idea for a cover, and this edition has revived the idea by using the image from the title page of the final book. It makes for a very nice cover, but personally I prefer the final one. It retains the theatre of the original idea but has much more drama, in my opinion, and the lighting is superb. Also, Hergé (or his team) felt that Tintin had become a bit too background on the first idea, so he's put right at the front for the final cover, breaking the fourth wall.
I too hadn't ever seen the floor plan of Marlinspike Hall before, although it may have appeared in one of the
Chronolgie books or elsewhere. I spent a while pondering over this, and it is very interesting. Hergé had even noted which period decor would decorate the rooms (Castafiore's bedroom, Louis XIII; The Maritime Hall, Louis XIV; Office, Louis XV, etc).
I was also very taken with Hergé's pencils for page 49, that shows Calculus's demo of his colour television. There are some more distorted sketches of the Thompsons in the margins I found very amusing.
Like RedVictory356, I was disappointed that they'd removed the headers from the original magazine version. I'd have much preferred to have had them even if it meant that the size was slightly reduced. It's made somewhat more obvious by having the text which originally introduced each page as a standard font text at the top of each page.
In terms of differences between the magazine version and the final book, there are very few. In fact, I think there might only be two frames, one of Haddock and Nestor (from page 26) that was divided into two, and another of Haddock skipping away from Castafiore (page 56) where the perspective has changed so it's viewed from the ground, since it originally made it look as if Castafiore was tiny and Haddock a giant. There may be some minor changes to the text too, but nothing I could spot. I note that the parrot is called Coco in the original French edition, not something I'd noticed before. Castafiore says it was a "typically Italian name", not quite sure what the joke was meant to be here. I do prefer his name in English, Iago, however!
Overall, a very nice volume and at a reasonable price too (currently). It's a pity we're not getting an English edition. Well, at least not yet.