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Install heat transfer and fresh air ventilation in wall cavity

Hi, I'm looking for someone to install a heat transfer system in our 3 bedroom unit, we'd also like a fresh air intake for the summer. The catch is there is no roof cavity, however, there is quite a bit of space in a wall cavity between 2 of the bedrooms above a built-in wardrobe (650mm deep). - Heat transfer from the living room (ground floor) to 2 bedrooms with a wall vent & ideally the 3rd bedroom with some flat ducting. - External air intake for use in summer - Basic control panel wired in (there are power sockets in the area) - Access panel in the wall We had someone from DVS come out and they seemed to think it was possible but just wondering if it could be done with more generic parts.