I'm going to be putting up an E5 stretch airframe for sale later this week. 74 flights. No crashes. It will include turnbuckles, the optional 4.5:1 tail ratio, the stretched tail, and the Quick UK magnetic canopy mounts on the front. I have to look at my files, but I believe I cut the boom extra short (700mm long instead of 715mm) but still gives about 11mm clearance between 606/96 blades. I cut the TT to give approx 2mm total clearance at the tips. I have all the measurements available on a Word file. It still has several of the electronics attached (VBar Silverline, Futaba BLS 255/256HV servos, and BEC Pro), but I prefer to keep those for a future project.
Overall, the E5 is awesome. I just prefer the stock version spinning 556/96 blades on 6S. I like it better than my Goblin 570, and certainly much, much better than my T-Rex 550 (which I just put up for sale).
Hope you enjoy your E5 stretch.