It should be sounding rocket-like in system engineering. In a very basic way is all that is needed. Need atmospheric pressure in the sample compartment. So, a venting system is needed. It is suggested that this lack of a life-support system may vastly decrease interest in the system.
Angular velocity is important to the microgravity people.
This is not a must, but is definitely desirable. Incompatibility problems are a concern here. It depends on the nature of the experiment, but some minimal ground support is required. A recorded reading of atmospheric composition would be useful but is not a must. In the end, it is agreed that a steady state of 10-5 is desired.