Pnegyesi, you read my mind.
I did not only dreamt of it, I actually started doing my little part to have it done more than 10\15 years ago:
I started with all my books and magazines, and I sorted all the manufacturers, with the models and tech spec in a huge list. This list is growing of hundreds (hundreds!) of makers per week, and it is now at about 7400 makers, but they are mostly old ones: I still have no books covering modern cars, and I'm sorting magazines starting from the 50s.
I am aslo collecting pictures, of each vehicle can be considered like that, homebuilt, one-off and so on.
I have kept the link to the book or magazine article of each and every model I listed there.
My final dream will be to match this index of all the cars featured in my papers with the folders I have with all the pictures plus the amount of knowledge that is here!
The boring part is already done (I mean the list of the well-known, known, less-known and barely-known manufacture is ready) and now each one can try to add what he could!