Best of luck with your new project Mr. Horse! The CX line has a good reputation for torquiness and reliability. Two things (that for me, anyway) lead to a satisfying ownership experience.
The rear suspension ideas are interesting, but I believe you will be contending with the "dip" in the rear subframe (there to lower the seat and look "cool") that is not shown in the "original" depiction.
Looking forward to seeing your progress, especially some pictures with some of your friends, as Mista Vern says.