fortunately semroc (and erockets has continued them) came out with 'Groonies' (grown up goonies) (erockets/semroc/skill level 1). personally I would suggest that one follows semroc's lead and make any scratch builds a trifle larger than the originals and use an 18mm motor. the originals didn't go over high and with todays mini motors they go even less high. with my zoom broom I wonder if the chute will open in time.
Rex