From RocketmanTan, the creator of this da Vinci tank papercraft:"...da Vinci was a great inventor, drawing up plans for contraptions hundreds of years ahead of his time. One of these inventions was his moving gun platform (affectionately called the Turtle). This was the closest to a modern day tank that humans would contrive of for four hundred years."
A download of the template for the tank is available here.
Detailed miniature papercraft fascinates me even though I don't have the patience to build it myself. Satoshi Yoshioka of Japan apparently has the patience I lack. ^^ Pictured above is Yoshioka's 1:72 scale BA-6 armored car model, one of seventeen historic military vehicle paper models offered free at his website here. Among the other micro papercraft models available are a M4A1 Sherman tank, a German Raupenschlepper Ost tracked truck, and an Israeli Merkava Mark III tank.
DeviantART artist "Technoscream" specializes in 3D renderings and animations of mechas. This Stalwart Robotic Missile Tank paper model is his first venture into papercraft design. The description of this mecha indicates it is encased in thick armor plating and armed with two missile pods and a hull mounted minigun. The finished papercraft is only around 2 3/4" (7 cm) tall. The template contains five different colored tanks and may downloaded here.
These two World War II papercraft models are free samples offered by the commerical paper model company, Paper-Pro Modeling. Most of Paper-Pro's products are deformed models that don't require any glue to assemble. On the left is a British Supermarine Spitfire fighter plane and on the right is a German Panther tank. Look for the download links for these models on the right hand side of the page here.
The Ford 3-Ton M1918 was one of but a handful of tank models that the US produced during World War I. The tank carried a two man crew, could travel at a whopping 8 mph, and was armed with a single machine gun. This papercraft version of the Ford 3-Ton, created by Joseph A. Golden, is intended to recall the paper toys that were printed on the backs of cereal boxes in days gone by. This tank and several other paper toys are available at Golden's website here.
These hover tank paper models were intended to be used with science fiction themed tabletop wargaming, but I think they are they are kinda cute in and of themselves. Since the scale of the models is 15mm (1:120), the template for one tank is small enough to fit on a single sheet of paper. Each of these tanks was designed by UK miniature gamer Jermey Claridge and may be download from his website here. There are three other tank models available in addition to the three pictured above. Also, each of the tanks may be built with either a plain metal, desert camo, or woodland camo color scheme.
Tanks were considered high tech weaponry during World War 1. However, to modern eyes the tanks developed during "the War to End All Wars" have an odd, almost Steampunk look. These papercraft are two of several 1:72 scale WW1 models created in 2006 by Clifton W. McCullough. Pictured on top is a British Mark IV heavy tank. Below is a German A7V heavy tank. Templates for a total of seven different WW1 tank models as well as a model of a German Halberstadt CLII fighter-bomber are available at McCullough's web page here.