This build is to give him the maximum mobility:

48 = Boba Fett (39) + Expert Handing (2) + Navigator (3) + Engine Upgrade (4)

So what is the best Imperial Boba Fett build!

I'd say VI rather than Expert Handling. The reason is that Expert Handling's stress and Navigator are mutually exclusive - if you barrel roll you pretty much can't use Navigator the next turn.

VI done't give you any more mobility, but it does allow you to respond better to the very high PS pilots, letting you make the best use of that mobility.

Echoing vi instead of eh

Recon specialist is always a good buy on any firespray.

Ysanne isn't bad crew either

Imp boba is ded.

Predator + Gunner + Engine

Need damage output as well as mobility, imo.

Predator+Engine+Rebel Captive

Boba /w VI

Academy Pilot x5

"Come at me bro"

Expert Handling doesn't make Navigator less useful, but generally a stressed Firespray is a dead Firespray.

Predator + Gunner + Engine has always been the most effective combination for me. Lone Wolf is good too, though. Recon Specialist is excellent on Firesprays in general but makes Boba vulnerable to blockers.