This is easily done but what is your budget. We could knock this out on a Crestron system with relative ease. You would need a control processor and a touch panel, poss a power supply or POE switch (depending on processor/TP model).
But, this could start from £3K-£4K, is this within your budget?
What do you mean you wanted it on the other wall - couldn't you have mentioned this when we prewired?