Great question, and glad to see you’re aiming to use the skills already existing within Dawul Wuru.
Many of the maintenance crew employed at Dawul Wuru have a wide range of skills, and some are qualified tradespeople, however there are no licensed plumbers employed at present. Dawul Wuru have an interest in upskilling their staff in trade related skills, including plumbing, so if there is an opportunity for them to be involved in some capacity (depending on your design requirements, of course!).
Please let me know if you have any further questions.