On a side note are the M models the same body at a 152?
The doors bowed out with the G model and tubular gear were adopted with the L. The 150M, however, introduced the panel / switch layout seen in the 152.
So, could be argued that the G fuselage was carried forward into the 152 or that the L fuselage could be directly swapped with a 152. Just about the only difference between the M and the 152 occurred firewall forward though. You could wake up in either and not know which one you were in... which might be scary for several reasons.
