[ GENERAL ] OOC 3
Tech Specialists in SWSE are always made using the Scoundrel class. But the Scout and Noble will also do. Unfortunately, Noble doesn't really have any Talent Tree that will help.
Feats you must take are Tech Specialist (like duh) and Scavenger (so you can use junk to make stuff). A Skill Focus or two doesn't hurt. You can take Hasty Modification (that has Tech Specialist as a prerequisite) that lets you exchange traits given to your gear by Tech Specialist. Or you take Signature Device (also has Tech Specialist as a prerequisite) to allow one item to be easier to modify and to have two traits on it, although only one can be used at a time. Gearhead is a good feat to take because it lets you do stuff in half the time.
Talent-wise, the Scout's Fringer Tree has some Talents that help with jury-rigging.