bolt on, it is a lot simpler to install but i have done these also and they don't come close to the structural quality as the GT's. For a show car the verticals are fine but anything more than occasional use i highly do not recommend using the verticals. I have people ride in my car and i remind them when getting in on how to open the door, but jus as quick when they get out they forget and jam the door out which stresses the hinges. They will get abused no matter how careful you try to be with them.
I do not fear what the future holds for me, I am not afraid to die.