Raise roller door / build framework / Adelaide

I have an old flat roof garage, and the roller door in the open position only leaves about 180cm opening. I would like to raise the roller door, without rebuilding the garage or raising the entire roof. Can anyone suggest someone in Adelaide (inner west) that can build some extra steel framework to change only part of the roof? Without going into detail, it would likely require installing a gutter near the middle of the roof.

I have attached a very simple diagram.
Attached Files

• http://www.renovateforum.com/images/attach/pdf.gif garage.pdf (87.7 KB)

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