Boost converter - high current
The reason you don't see too many high current examples of a boost converter is that the magnetic component would become very large.  Remember that the peak current must be higher than the average (output) current, so the inductor that stores the energy from each pulse must have very heavy wire.  Similarly, the capacitor currents required to smooth the outputs will have very high currents and also must be large.  Finally, losses are large from every component (capacitor ESR, Inductor Resistance, and at 125 amps a diode drop is 100W or so). Small voltage drops are large efficiency liabilities when dealing with low supply voltages.

What you are suggesting is not impossible but would be challenging to say the least.