Quote:
PlasmaKrab said:
The problem is, you can smelt everything you want, with decent foundries and heavy motor plants (making trucks, tractors, mining vehicles), you can probably come up with some old-style armor good enough to invade Connecticut or Mexico, but to replicate modern MBTs from scratch, you also need advanced technologies
....
Now if you want a couple of homemade designs, let's get going! 
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For homemade composite armor:
Marvin Heemeyer' killdozer
http://en.wikipedia.org/wiki/Killdozer_%28bulldozer%29
It seems killdozer was resistant to at least some HE, though it's not clear what kind and amount of explosive was used.