Dating back to my time on the 'Dark Side' I still subscribe to 'Tankette', the Magazine of the Miniature Armoured Fighting Vehicle Association. In the latest issue is an article by Tom Bell telling of how he is starting to upload some of the 400 high quality technical drawings in 1/76 scale by his father, the late, Mick Bell. Released under the Creative Commons 4.0 Attribution license which makes them free to download at mickbellplans.com
Tom says the website is a work in progress and he will continue uploading and posting the pans in batches. I checked the website and those currently listed are from many countries including the UK, Australia, USA, France, Poland and the USSR, ranging from WW1 to modern. I've attached a photo of the page in Tankette but this is nowhere near as clear as the plans on the website. One bonus is it mentions scaling up i.e. to make 1/76 to 1/72 print off at 106% (something I would never have worked out!!!).
I can heartily recommend the site as not only does it cover AFVs but also vehicles used on airfields etc.