Inverted grow direction of raid frames
 

Is there any way how I could invert the grow direction of default raid frames?
I want them to grow down to left, instead of default down to right.
(I usually play as healer and I like to put my frames to right of my character and when new players join they grow over the middle of the screen which is really annoying)

I have tried finding addon that could do this but with no success, so I'm trying to write one my self.
Maybe its possible to recommend some raid frame addon code as base to create my own?

Thanks in advance.
:)