Thank you both, especially dr_st !

Cusom PCB sounds too fantastic.
My next step is to take another look at factory PCB with another guy, who has proper skills.
Maybe we could cut/solder something out of the factory board.

I have X230 (23252CG) and UltraBase dock. I regularly use Ultrabase with additional HDD (in caddy). It's convinient, because it's one pice, and perfectly mobile; I can take it to bed or to another building without messing with HDD enclosure and cables. But Ultrabase lacks USB 3.0 support. There are ...