Hello.
Nice thread!
I have found this and it seems to me more than interesting
http://www.all-car-brands.com/
Some guy, in a corner of the world had dedicated 15 years of his life to make a car encyclopedia database with 7000 car brands, 70.000 car types and 500.000 photos.
Few days ago he (by the way, it is a single guy, as stated on another forum) started uploading it on this new website.
There are almost 1000 cars uploaded right now, but the uploading pace seemed to me pretty high with 50 to 100 cars daily.
My opinion is this:
HIGH:
-every brand uploaded is complete and up to date
-it is very well structured, with sepparate galleries for each facelift or special version
-it is very promising
LOW
-the pics are only 800x600
-although there are photos for every car, text description is available for about 75 % of them and videos for about 40 to 50 %.
PS: I have seen that the texts for each car differ, some are small and some are large and complete.
Anyway, i think it is a nice effort and probably 3 to 4 years will pass, untill everything is uploaded.