Thanks for the follow up questions and for clarifying!
Both of these questions you’ve put forward will need to be decided by you and your team as you do your research and put together your design proposal.
For whether it needs to be a gap between the walls or it be one straight structure, that will be up to you to decide. What are the benefits of having one structure vs having gaps in it? Why is one better than the other, based on your research? This is part of the decision making process which you should go through with your team as you put together your report, while documenting why you made the choices you did.
In terms of maintenance, similarly this will be up to you to depending on your design. You might think about, who is best placed to support maintenance of these structures? Is it someone / a team in Dawul Wuru? Or will this have to be externally conducted? If it’s external, who will do it and how much will that cost? How frequently will maintenance be conducted? All of these questions will depend on your design, and you should recommendations in your report for how the maintenance should be conducted.
I hope this helps! Please let me know if you have any further questions.