PhilDawson8270
Veteran
This is the layout on the seat tube I`m talking about.
Can you take a photo of the top of the bottom bracket, next to the seat tube. There should be another whole for mechanical cabling.
Your frame is Di2 compatible, so that will be the exit hole for a Di2 wire to the front mech.
With regards to mounting the mech, you will need either a clamp on front mech, or you can get a braze on mech and a clamp on mount like this http://www.planetx.co.uk/i/q/FMPXCLAMP/front-mech-band-on-clamp
Often preferable to do it the latter way, as many groupsets come only with braze on mechs.