Imbed three canted motors as high up as you can get on an oblong pumpkin body. On the bottom place a large and long as possible tail or multiple streamers, what ever looks good. Blow off the cap and deploy a black bat chute. Nice thick 1/2 inch rod through the center with a full length KN aluminum launch lug.
The body could be a modified 2 liter soda bottle with a real pumpkin skin overlay. That would be very Hannibal Lecter style so hopefully the RSO would be in the Halloween spirit!
Nose weight as needed. Three F15, two plugged an one at a short 4 second delay. Quality launch system and clip whip with cherry picked old Estes ignitors, Q2G2 or home made specials. Good weather conditions a must.
Keep the weight up high and the drag down low and you might have the most stable rocket at the launch, but no one will know as they run for cover because it is so funny looking with no fins and silly canted motors placed near to the mid body instead of the back where they should be!