Just a quick tip. You may want to switch to velcro straps or cut slots in the tray to mount the zip ties/velcro straps so the battery or zip ties won't move at all. 
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Brushless RC18T, Brushless Micro DT, Midwest AeroStar .20, SCX10 Honcho, Duratrax 1/5 Firehammer MT, Traxxas Nitro 4Tec 3.3
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