ive had a look at my factory built chassis. its 3mm and the rear driveline is installed but it seems very solid. The diff is also supported by the length of tube underneath that stops this from moving forward and backwards. If you were planning to strengthen it you could add another plate on top then the diff wouldn't be 3 mm lower.
not planning on any additional support on mine though.
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Click to see my build photos on Flikr
http://www.flickr.com/photos/67112582@N03/
Saturn MX5 Based Chassis, Limited Slip Diff & 2.4 Quick Rack.
Build cost.... seems to be spending more on tools than car bits at the moment! (they will be handy in the future though).
Car iva'd and passed 15/08/2014. Finished weight 572kg.
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