I cut four, 1" long sections of PVC and mounted them on the front of the pumpkin as standoffs. Now I can at least push the bulb side against a wall and the bulbs will be secure. (I love PVC!!!) (Not shown - I screwed a couple pipe brackets onto each vertical side of the big pumpkin frame. For mounting in the yard, I'll just drive a couple sections of rebar into the ground and slide it down over them.)
Here are the small pumpkins. These are actually plastic treat buckets I bought at Target for $1 each. But because they didn't have a top, I bought some plastic orange plates, cut the rims off and with a few dollops of silicone glue they fit perfectly on top. For pumpkin stumps, I cut a short 3/4" section of PVC that was painted green and glued it to the tops.
I used a fender washer and 1" sheetrock screw through the bottom and mounted them on two sections of lumber I'd painted black. This will make them easy to store and especially easy to set out. And they're not likely to blow around, either.
With my Dremel and a diamond saw I cut a V-shaped flap in the back/bottom of each for wiring access and placed a string of 20 mini-lights in each.
This completes this project for me... great fun. I wonder what life will be like when I grow up???