If you have a look in the 'show me your' section you'll see lots of installs. Personally, I got rid of the ESC tray. I put my Reventon further inboard, but also had a Spektrum micro receiver flat between the ESC and servo.
Using the no-more-nails type stuff to fix your electrics provides excellent adhesion without mucking up the chassis on de-install. (LMR flog it as do DIY places and I think Inside line racing - if memory serves)
Pic of mine:
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