Gunslinger certainly sounds right, and definitely a lot of Charisma to smooth-talk his way out of (some) situations. You probably will want to bump Intelligence up at least enough to mod energy weapons and hack computers (not that Han hacks, but basic knowledge of computers would clearly be present). Even though it helps VATS accuracy, you could probably stand to lose a few points of Perception if you had to --- Han ~has~ run around a corner face-first into a pack of Stormtroopers before, after all.
Also, considering how often the Millennium Falcon breaks down after he is "sure" he fixed it, he might not have much in the way of Luck (although I ~would~ get at least enough to get the scrounger-type perks to find more ammo). There aren't many Endurance perks I'd bother with (for this character anyway) so even though Han may be considered "tough" by some, I don't see any point in raising it over 1 (ditto for STR --- he has a giant walking carpet to carry things).
I'm not sure, but I would not be at all surprised if someone already modeled a DH-44 (or whatever it was called) pistol like the blaster Han used in the movies. If you're on PC and don't mind using mods. The "sarcastic/funny" dialog lines should generally fit the character, with some of the aggressive ones thrown in occasionally .
It can be fun to mix genres ---- when I got bored of Fallout: New Vegas, the game was drastically re-invigorated for me by using the Fallout: Who Vegas mod, which combined Doctor Who elements with the New Vegas game. I'm talking actual working Regeneration, working TARDIS "home" with multiple rooms, new crafting, actually capable of fast-traveling to various locations, sonic screwdriver that unlocked things, etc. Clothes from the various incarnations of the Doctor and his companions, etc. They even had complete adventures scripted out including the Weeping Angels (which was amazingly true to the show: if you looked at them, they became immobile and un-attack-able but if you looked away they could move and chase after you).
Han, luckily, can be replicated pretty easily by existing vest combos and I'm sure it would not be hard to make a nearly exact costume via mod. Someone already has Deadpool costume mods out, after all.