I'm a scientist of a colonised alien world in the far far future, on a planet which plant-derived insects and meat trees are keystone species in their biospheres. Let's say, I wanted to genetically engineer these plant-insects, let's call them microdecapedes for now, to survive in space for about 3 hours: how would I go about that?
Their biology and evolution
(pictured above is the species I would like to genetically engineer)
These animals originated from seed-baring trees, which originally had muscled seeds which looked much like worms which would move along the ground like a caterpillar. Due to competition, these seeds became exceedingly complex, being able to locate other pseudo-seeds using pheromones. This species however, has lost their plant stage in their life cycle through neotony completely. Leaving us with the cosmopolitan, 10 legged, hermaphrodite plant-insect we see today.
These creatures rarely exceed 10 centimeters in length, altough they do live in an oxygen rich (25%) world with less gravity (72% that of earth). They lack lungs, and instead breath much like insects on earth, through the spiracles running along the sides of their body which can be closed and opened. They lack eyes, or even a proper brain, so instead rely on pheromones to locate one another. They have light-sensitive skin spots all over their bodies to find suitable locations with which to lay their eggs in. These creatures also lack hearts, and use haemolymph once again, much like insects on earth. Their skin is made out of the same stuff as plants, not utilising chitin. They're frugivorous and eat through their mouths positioned in between the sensory organs near their heads. They're hermaphrodites, having a vagina on their chin and having a penis-like organ on their chests which they mate with. They have a hydroskeleton like spiders used to power their legs. On avarage they range from 4-7 cm in length.
How would I, a future scientist with incredibly advanced technology, need to engineer microdecapedes so they could survive and perform basic tasks such as move its legs, in the vacuum of space for 3 hours, no matter how different it would be from the original species?