To create a stand which will hold the double helix upright, cut two squares from the cardboard large enough to hold up your double helix and punch four holes in each corner. Two opposing holes need to be further apart for the two straws then the other opposing holes will be for the double helix pipe cleaners.
Feed the pipe cleaner double helix through, bend the ends and tape down.
Next feed the straws through, cut the ends, flatten and tape down.
Repeat this for the opposite end.