No there are not any rules for the Tiger Mech. However, the e-zine Dust Chronicles does have vehicle upgrade and design rules (issue #2, in the "Rosie's Scrapyard" section). The first two issues are available as free pdf downloads and can be found at
www.dust-chronicles.com. They are filled with background info, scenarios, modeling and hobby tips. Issue #3 will be out on the 1st of December 2012.