Question re: Italeri Porsche 956

Can anyone please tell me if the 1/24 Italeri Porsche 956 kit's plastic was designed by them, or is it a re-box of someone else's molds?  I know it's not the Tamiya kit, I have 3 of them, but would like to know both the source of the moldings, and if anyone has any experience with the kit and how it was to build.

Thanks very much, in advance.