FB1 FB2 FB3 L301 L302 are components that could be missed out......but just choose any ferrite bead to replace them, anything that can handle the current in them, and not drop too much voltage in passing the current.
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TI T2 and T3 are all the same part...the bom is weird.
they are all current sense transformers....
I cannot understand why you need a 3 phase power supply to make a 3 phase power meter, surely all you need is the incoming three phase.?
Maybe you attach your incoming three phase to the 3 phase power supply, and then selectively load the 3 ph power supply so as to test the meter works.