Great job on your build I have finished my X1 CRT, you my want to look at it and maybe see the issues that i have found, a Slash weather proof receiver box would be so much better then a lexan box and the Slash box will bolt right onto the servo plate without any mods. It may be that your battery tray is to close to the spur with a battery in it, I found it best to wait on installing the tray until I had a battery I had to move my tray twice. You could always put 2 nihm packs ( they would have the same hieght as a 4 or 5 cell lipo )in the tray and see if touches the spur. Here is a link to my build for you to check out http://www.rc-monster.com/forum/showthread.php?t=17637 Keep us updated.