Hey Tanaka
Sounds like your team have made some really solid progress.
Regarding budgeting, some handy points
1. Review the cost and economic benefits as well as the delivery and ongoing maintenance aspects of your proposal https://ewbchallenge.org/challenge/saibai-island-tsirc/design-considerations/
2. Research what TSIRCs annual capital works budget is for 2025. Based on our own research, the budget has increased substantially for FY24-25 compared to FY23-24
3. If your design idea is significant in terms of deliverables/scope, perhaps you could assume that QLD State and Commonwealth grants could help realise your idea, particularly if there’s genuine cultural, social and economic benefit for the island community.
4. Research the employment industries and average income of the island community, which may help with your budgeting
5. Consider ongoing operational expenditure to support the maintenance and operation of your design solution.
Hope this helps