Matthew - I previously was an employee in a company with project-based revenue streams and a family member owned and operated an abatement/remediation business that was project-based. Aside from more specific questions you may have, the three big takeaways for me for operating businesses like this are:
1. You have to constantly be keeping your sales pipeline full.
2. You can get creative on the payment structure (i.e. fixed fee, milestone payments, EAC, etc.) to try to better fit your cash outflows to limit risk. The types of customers that you work with will determine how open they are to these arrangements (i.e. government, private sector, etc.).
3. You will have to keep a larger amount of working capital in the business than you might expect.

Happy to chat further if you'd like.