Support For a DR4B L - Channel or C - Channel

Hi, I saw for ITZ that 5225a had a DR4B that was excellent, but used L Bars. I wanted to make a claw like Tesla AC Robotics Which may have some weight but instead of being that big I will make it extend using slides of some sort. I am guessing about 1 lbs or less of weight on the top.
BIG QUESTION: Should I use A regular C- Channel or an L - Channel for my double reverse 4 bar?
The Good thing about an L - Channel is that there is less weight but maybe have some problems in supporting weight but the C - Channel I think is too heavy and will make things on my robot Confusing.
Also if I choose L-Channel for my DR4B is there any way i can increase support without adding too much weight?

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