The first part of constructing the surface suit will be development through analogue testing in relevant environments.
The current thinking is that the suit seeds to be as light as possible, but be completely self-sufficient. Consumables will need to be swappable while wearing the suit. (Remember, the first four will spend two weeks in it, and the follow on missions may need to spend 3-4 days in them.) We do not intend to significantly change the suits unless a dramatic change is made to the state of the art.