If I remember correctly, each wing has its own root rib with a tab on the root rib that bolts to the cabane structure itself - really doesn't get any more simple and effective than that. The new bottom wing design is a simple bolt-through-the wingtube method. It is crude, and not as slick as the origional cam/stud setup, but it is lighter and easier to manufacture. I talked to Aeroworks about this Ultimate and it went from a 44 pound down to a 42 pound setup - WITH tuned pipes!!! This is VERY light for a plane with 3300+++ squares of wing. A DA or 3W 170 will be the ticket for this plane, and it will be phenominal! The best-looking Ultimate I have seen in my 20+ years of modeling...my opinion only, but man do I just LOVE it!!!