the bmi chassis that i received had the battery slots beveled and yes if no one hit you or you didnt hit anything it was fine but in racing that dosent always happen those bevels acted like a ramp and wasnt to hard to nock out of the slots when filed off the bevels the problem was gone im not trying to nock your product i think your stuff is awsome but the beveled battery slot was not a good idea im sure you tested your product but in a real race situation this is what happend to me it was an easy fix but i just felt after spending 129 then having to file out the slots and then hearing their was a better top deck for more money then a fix for the ntc3 swing rack it gets a little expensive to have to keep upgrading it to get it to what it should have been standard i think that your final one 3mm topdeck fixed ackerman no bevels on battery slot is the perfect complete chassis hope you understand my opinion thanks jesse