De Rosa Planet Question

Hi all
I’m new to this Roadie stuff so go easy (MTB background but fancy a change)
I’m building a De Rosa Planet 2016 and have a couple of questions.
1. Does anyone know if it will take a 28c tyre?
2. I’ve fitted a standard cable guide on the BB but not happy about the angle between it and the cable going into the small hole for the front mech, so is there a De Rosa specific guide I need? The standard guide I have is a campagnolo one that was suggested on a site I found.
Thanks for any suggestions.