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The main problem with all these DIY solutions as I see it is that output voltage is fixed. Given the currents vary in great range the voltage drop on the cables also varies much and so the voltage at the car. So either cables need to be very short AND thick (very impractical) AND clamps need to be of very high quality or voltage at the car varies too much for my comfort. Professional PSUs I've seen (gysflash 100-12hf included, according to their manual, which immediately tells me they have quality product) automatically correct output voltages based on cable characteristics and current consumption so voltage at the car stays more or less stable. No pun intended, but I think people considering DIY should know that.