I don't know, but seen tamiya never re-issue metal main parts r/c car before, and heard before that the metal mould is not belong to them, don't know, sure I want they can re-issue, but re-issue the old design will be the best. plus sorry, the time past too fast, see that qd rough rider as 'new release' when in japan, but last july.....
but xr311 only made of bended metal sheet, are the process same as injection mould? don't know, just think if these is ok, rough rider and hi-lux should not same as XR311, mostly will heat.