That is what is called a Quarter elliptic spring. It is actually a somewhat popular setup. I first saw it on all four corners on a T that a gent named Mike Minette, (spelling may be off) built in the early 70's in Texas.
here are a couple of photos of a T that was at the Run to Roslyn in Wa State two years ago.
I have no idea who built this car but the front end is pretty simple and wouldn't be expensive to duplicate. It appears to have a late 40's early 50's pickup front axle with brackets bolted to the original spring pads on the axle to connect the spring eye to. The springs are just as you mentioned above, springs cut in half. These may be 46/48 Ford pickup front springs cut in half.