Both of the kilts I wear most are made from a thicker canvas like material. Both are fairly heavy, but both are also 6 yarders. For me, I would grow excessively impatient trying to pleat 8 yards, and 4 yards didn't work with the calculations I was using to do my kilts.
I haven't had a chance to wear my SWK Solid Black Economy, so I can't compare it to the ones I made. Based on only having tried it on, only to notice it's too small, I'd say the ones I made are heavier.
I must admit, though, that mine are just light enough that I won't go Regi in them.