You can review the pictures of king post trusses at Fox Maple in the thread about king post, and Fox Maple pictures in my gallery.
You might need to have a king post truss with small queens as well.
Any design should be built for future use as well as current use. If you sell the property will the new owners know that the floor load rating is only 2 psf?
You maybe should build it to standard loads now, the right way or no load at all, and forget the attic storage idea......