I used mine for metal craft that we sold at craft shows. I got a dual power, 110 and 220, because don't always have 220 available. At 110 it will cut 3/16 smoth. Most of the time I am cutting old saw blades, so it works great. I paid more but American. Hyper-Therm 30xp. Very easy on the...
As you said but, go one step further. Spread the cement powder pver the crushed stone or screenings or even just good clay dirt. Then till it up wet and compact with hand tamper or plate compactor. Dirt concrete has been around a long time.
If you have a 7800 lb backhoe pick It up and set it over. It won't hurt it unless it is just a 3 point hoe on a bigger tractor. If it has a sub frame it will handle it.