The problem is that to make an aftermarket rack and keep the stock roof bin would be a real pain and it would look silly. If that is your goal, just use a Loadwarrior. Here is my suggestion.
First off, one that fits the 05-06 X.
I would want something similar to the Calmini rack w/:
*Removable expanded metal floor.
*The bottom of the rack should follow the roof line, but the top should stay the same height. (so the front is deeper than the back)
*Front and rear light tabs
*Front Air Dam
*Some sort of release system so the rack can be removed without needing to unbolt it from the roof (the mounts can stay).
*Compatible with the Yakima Loadwarrior accessories.
*Front should be formed to fit some sort of aftermarket case (ie. Pelican case) so those of us who the stock front bin and don’t want to lose that functionality.