I'm with Alex - so long as the car weighs at or above the BRCA minimum limits, then they comply to the prevailing regulations - be they either LiPo or NiMh powered.
There are (as I'm sure we'll all learn soon enough) plenty of situations where the known but comparatively heavy configuration of a NiMh car will be easier and more forgiving to drive than its LiPo counterparts.
Come the 1st national in 2009, if the conditions get slick or bumpy during the day, I'm sure there will be plenty of newly LiPo converted runners who'll be busy adding weight to their cars just to get the handling balance back to something more normal that they're more used to - and lets not forget that 8mins of practice isn't a great deal of track time to start trying to learn how a new car or weight distribution really works.
Besides, I've got no idea where I can put 170g's worth of ballast in my 4WD
