Another approach, albeit loosely defined, is to run the supply, use a IR
handheld thermometer, record key component temps, then load it
to desired load and rerecord heat rise in components. Not by any means
meant to substitute for design derived limits, but a crude representation
of its efficiency and currents.
Also any of the semi components marked, look at their datasheets. If
datasheet says diode is 5A and you want 50, that's a show stopper, 50A
that is.
If you are going to use this in a life support application throw this idea away.
Regards, Dana.