I'm doing the same mod to my SIG Kavalier at the moment. Although the basic construction of the Kavalier may be different to the tiger, the principles for mounting the servos in the wing should be the same. I have some details on how i have done it in a build thread here: [link=http://www.rcuniverse.com/forum/SIG_Kavalier_Build/m_2338990/tm.htm]Kavalier Build[/link]

It really didn't turn out as difficult as i thought, just be sure to plan out exactly what you are going to do first!!