Hi Martijn,
Great to hear it. It is just mandatory to share your pictures with us

Do you mean routing brake lines inside the chassis? If yes it should be possible, for example fuel lines at least in my injected model, are routed in such a way. So I do not see any reasons why it would not be possible with doing it with brake ones.
There was a Canadian guy at this forum who drove from Canada to Mexico in a beta coupe. Really great idea.
I would love to drive my HPE around Italy...