As the others, I hate to be negative but those tongs are just too light to last and rebar is made of questionable metal that bends easily. I'm all for home-made stuff and you have a good general starting point. From there, modifications can be made.
I do a lot of logging and clearing large eucalyptus trees. I have 3 sets of tongs, 1 skidding (dragging) and two lifting, that are very heavy duty. They have had to be repaired due to hard use but the basic tong structure has never bent or snapped.
Here is a photo of the light duty skidding tong on a tractor attachment that was built for the purpose. The light tongs can be switched out for heavier ones as can be seen in the construction.
The attachment is great for holding logs at waist level for bucking thus saving the back.
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