I made the cake version last night & it is a hit with my family.
I only used 8 oz. of the Hershey's store bought caramel & 2 crushed Heath bars, which was more than enough. The caramel is not overpowering & their are candy bar pieces on the entire cake.
Made the homemade buttercream frosting also. Everything was very simple to make.
The only thing I don't understand is why you need the salt? I had sea salt & used it, but would it really matter if you didn't? Is it a sweet/salty thing? I'm not sure it would change the taste if you left the salt out.