Rim fire 80 and a 6 cell is acutly more weight then a dle 20 , only thing would worrie me is you'd have to do some work on the fire wall maybe
but DLE 20 and the great planes 60 size airplanes have been working like the revolver and the escape , big stick 60 .. it would be border line .
also flyinggaints has a thread of aDLE 20 going on a 60 " EF extra ..