I made it and here it is : http://www.filedropper.com/customxwing
I built it myself and only had to change the engine because grey barrels are freaking expensive, i used technic "2x2" wheels ( those who were common in old Bionicles ) and a small wheel ( same as those on the cannon ) for the end. I modified it a little bit there because the piece wasn't available in LDD, so i went a little bit creative.
And also it's missing 8 1x1 grey tile used in the front of the engine, i couldn't get them here in LDD because that's not a lego regular building technic.
The sad thing about this model, at least for me, is that the wing don't fold very well and tend to break, so i have to open the body to open the wings. But since i don't really play with lego i build a little stand and it look like a mini UCS