I see that most gimbals are made of aluminum and few carbon fiber.. I'm looking to make a light weight gimbal using scrap parts like acrylic for a light camera like Mobius but using standard size 2204 motors to keep cost low.

This is how I plan to start.. these are parts from an off the shelf gimbal of which I'll be using only the parts on the right side of the picture. Any suggestions for mounting this to quad? How to go about pid tuning?

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So.. apologies for no updates on this.. I managed to complete this enough to flight test it on a 450 size quad. TO my surprise the roll and pitch corrections worked fat enough to stabilize the video. But due to a lack of rubber dampeners and also due to the flexing nature of acrylic, there are loads of high frequency vibes which can't be eliminated using just PID tuning. Stiffening up the gimbal frame helped, yet to find a soft mount solution. Didn't bother to do more as I found software stabilization works a charm.

Gimbal config software: SimpleBGC (Basecam) version 2.2