Gerst Tubular Suspensions

One thing I was wondering about and I haven't seen yet, what's the weight comparison of this setup over stock? Since the setup is mostly built from .25" steel, this makes me think that the weight will actually be quite high considering some other setups get away with using thinner steel. And as far as that goes, how would the weight compare to an HDK or similar setup? It just seems like I'm seeing a lot more steel and weight is all.