Generate 10A for stress testing
Yes, it's feasible to make such a supply. In my experience bench switching supplies don't like to output less than a volt or two, but such a supply could be designed.

A faster, and probably cheaper, approach might be to repurpose a cheap PC power supply. A $15 supply would likely be able to output 15A on the 3.3V or 5V rail, so if you add a series resistor you can get a more-or-less constant current. The PC supply provides isolation for safety, so even if you made your own supply it would be a convenient place to start.. You have to ground a wire to get the supply to start and to provide some load (10W resistor) on the 5V rail - do a search for details. 

If you use a chassis-mount 0.33&ohm; or 0.5&ohm; 50W resistor that will cost about $5 so total cost could be under $20 especially if you scavenge the supply. Be sure to bolt the resistor to a suitable chunk of metal to act as a heat sink, perhaps using a small 12V fan powered from the PC supply.  

If you are dead set on making a SMPS for whatever reason, I suggest you start as above, but use the 12V output and a decent controller chip such as an LT3800 which uses external transistors. It's not as easy as it looks, and it doesn't look all that easy. If you add a 0.12 ohm 15W sense resistor it can be coerced into outputting 10A constant current, but add a diode and resistor to keep the output voltage from getting too high with no load. With a few more parts to shift the feedback voltage upward, the sense resistor could be reduced to a smaller, lower power, part. If the latter makes no sense to you, there will probably be difficulties (many ruined parts) in getting this to work. 10A is a fairly high current and even small inductances can cause problems.