Here is an alternative to consider: start with 8 15 13 8 12 15 and take the Resilient (Con) feat. Your hp will be the same but you will be better at Con and Wis saves. I say this because:
1) The extra hp for a rapier vs a short sword is not as important for rogues as rolling sneak attack dice as often as possible. If you want to do more damage while dual wielding, take a level of fighter and take TWF for the Dex bonus to the off hand attack.
2) Your Fancy Footwork ability makes it less likely for you to be targeted with melee attacks, so Dual Wielder's AC benefit is less important to you than it would be to other rogue types who can't avoid AoO if they use their bonus action for off hand attacks.
3) A lot of bad things will happen to you if you don't make Con saves. If you take Resilient (Con), with Evasion and maybe eventually Slippery Mind you will be a save monkey.
I haven't played a swashbuckler but I have one in the party I regularly play with. Our swashbuckler's shtick is hit and run, using Fancy Footwork to avoid AoO. If her first attack hits for a sneak attack, she often gets out of the way without making an off hand attack in order to use her bonus action to hide or dash to some other position in the fight. She uses her bonus action for the off hand attack if the first attack misses, and then uses remaining movement to get away. The upshot is that attacks against her AC happen less often because, unlike other rogues, she never has to choose between staying put to use her bonus action for a second try at landing her sneak attack or else using her bonus action on Cunning Action to disengage. Assuming she didn't use all her movement to engage or there aren't more than two adjacent enemies, she can always step out of melee range without triggering an AoO.