Need ideas for roof top mounted camera Bracket

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I am going to mount a CCTV camera on my roof to view the city area from a website, I have a camera housing and camera HO-SAH725HB-2 Vandal Proof Housing (http://www.gsscctv.com/ho-sah725hb-2-vandal-proof-housing.html)
weight is about 3KG with camera and its pretty big.
would you consider this mounting bracket setup appropriate for my set up I am wanting?? I want to build a bracket like the attached picture and mount it on top of the ridge capping, take 4 screws out and stick it on and put the screws back in and that should hold it nice and firmly without movement I hope. is it ok?
anyone think of a better way??
what type of metal should I use? aluminium?? mild steel will rust badly.
Attached Images

http://www.renovateforum.com/images/attach/jpg.gif bracket.JPG (http://www.renovateforum.com/attachments/f85/99858d1389242191-need-ideas-roof-top-mounted-camera-bracket-bracket.jpg) (34.8 KB)
http://www.renovateforum.com/images/attach/jpg.gif ridgecap.JPG (http://www.renovateforum.com/attachments/f85/99859d1389242200-need-ideas-roof-top-mounted-camera-bracket-ridgecap.jpg) (67.9 KB)




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