IMHO, the Hetzer would be of limited value in RO as it stands vis a vis the current selection of maps; Hetzers were ambush vehicles, and with the exception of the various BDJ maps there's just not a lot of proper concealment to make them worthwhile.
I dont' know what the RL specs on the Hetzer's gun traverse are, but if it's as bad as I think it is this would almost make it a necessity to have a minimum two-man crew (left Left LEFT no right a little....STOPP!) if the thing were caught in the open- and if in ambush, that field of fire better be perfect!
OTOH, Hetzers are VERY cool-looking death machines- do we get points for style?