The engineering aspects shouldn't be too hard, although I don't have the skill to advise you on them. I do know the size limitation on Insecta is at least partially due to the inability of their respiratory system to process large amounts of O2. Inability of their mechanical structures to scale up in a gravity environment also plays a role. OTOH, fish live in a gravity-free and oxygen-poor environment and they grow to enormous sizes.

I would imagine all the hardware you need for this experiment could be picked up at a hardware store and medical supply house. You might need to run some preliminary experiments to determine oxygen toxicity at high concentrations on your subjects.

I think it would be possible to rig up a light-weight self-contained, sealed experimental habitat housing very fast-developing insects (perhaps caterillars?) that could go up to the Space Station.

I know spiders have gone into space to check the effect of zero-G on their web-building capability, but I don't know the results of that experiment. As I recall, it was a high-school science project.