interesting read, though I would check your local regs 1st before doing a thing as looking at that layout used in a home, personally if I was going to prewire a home or retrofit 1 I would use conduit right the way through..
comms cabling and data points base on 1 standard, cat-5e, cat-6a or cat-7, check the min regs with your telco provider..
2 years ago in Australia telco mandated cat-5e as a minimum install requirement..
not sure what your telco providers mandate min code install requirements within the states..
I would do a colour code install for comms cabling, personally i'd go for cat-6/6a..
where you're going to locate points close together 100mm separation should be observed with conduit going down the walls.. separation of services should be mandatory..
personally I'd base a whole home on 220v, it's a bit of a bitch having to use step down transformers on gear just so you can run 110v..