I have a thunder1 in a bulldog. it was a pretty good fit. I cut out the half the battery box and made it into a speaker box with an oddball pc speaker. I used 2 small rc 9.6 volt battery packs and squeezed the big old 7.2 off to the side. i epoxied the onboard charge plugs cables to the side of my home made speaker box . this works great, all i have to do is unscrew the battery cover and my charge plugs pop out. this is the wifes tank. she didnt know I put it in I always have to beg her to drive her tank with my cd panzer3 , even though i know she has fun. . now no offense to women out there, but my wife drives her tank like she drives a car. she always pushes full up on the stick before the tanks lights stop flashing. needless to say the bulldog started and the tank moved full throttle forward. the thunder one at full throat. the next instant her controller was airborne and she was in tizzy holding her hands straight up. the controller was history and the only thing we could hear was the idle of her her "new tank". I got a replacement controller form mato, and a good chuckle to boot. the thunder 1 is really neat and I have to agree creepingdeath is a top rate company. I too am excited about the new gun system. I have the cd panzer3 and it still works as great as the day I got it.