Anyone own a Felt F series roadie ?

[Doyleyburger]

So I'm looking at the possible purchase of a felt F4/F5 and can't seem to get a definitive answer regarding internal cable routing for di2 which I would install further down the line.
Felt have assured me via their official Facebook page that all the F series models offer internal routing for di2 even though they choose to run there cables externally.
If anyone can shed any light on this subject I'd greatly appreciate it.
Thanks