You're probably gonna have to go down the universal 'box of scaffolding' bracket path.
It's no bad thing. I have one hanging my TV on the wall, it's rock solid and was far cheaper than the Sony equivalent.
It ain't pretty, but who cares? Nobody gets to see it back there anyway.
A/V: Sony KDL-V40A12U & BDP-S350, BT Vision, Onkyo TX-SR875, B&W MT-30 7.1, QED audio cables, Russ Andrews power cables.
Hi-Fi: Arcam CD72T & A65+, B&W 602S3, Partington stands, Grado SR125, Kimber I/Cs, QED speaker cables, Russ Andrews power cables.