You can build in the same way as developers do. The incoming cable goes to a comms cupboard with 13A power sockets that houses the internal termination box, hub, splitter, router (optional) and network switch. From the cupboard you run Ethernet cabling to each room that needs it and coaxial cabling for the TV boxes. You can put in draw ropes for the coaxial cables for the VM tech when he comes round to do the installation, he'll thank you for this.
Absolutely, it's no different compared with other utility suppliers. After all, you don't see Openreach digging up roads and pavements of newly-built developments to install their cabinets and ducting.
The developer and VM collaborate on the development and some work, e.g. the ducting, concrete work and footway chambers, must be done with the approval of the VM Delivery Engineer. In my estate I dare say that I'm the only resident who has noticed the tobys flush-mounted to exterior walls and level with the ground, a sure sign the Barratt Homes had a cable company on board (it was Telewest) during the build in 1999 and 2000.