Fico86 at the Unofficial Command and Conquer papercraft site has made the Mammoth Tank available for download. It's not gone through a thorough test build yet so for those that would want to try it you might encounter some minor flaws, if that happens please send word to the designer so he can fix it. For dial-up users, the PDF file has both the instructions and pattern on it but hasn't been fully web optimized - comes in at 23MB.
Command and Conquer Papercraft - Mammoth Tank [candcpapercaft/Fico86]
Command and Conquer Papercraft [Related Papercraft Articles]