I am glad my articles helped you a bit !
if you want to amount of days related to your budget, it is (of course) possible with coda. Not every day is equally expensive (post production, production, post production) so you need to develop a logic that shows the value per work type.
Your doc is a starting points, however to benefit more from the many advantages Coda, offers you might consider a different structure, one that is more granular and less excel alike
The moment you have a budget per day for let’s say pre production and (10000 dollar and each day costs 2000), you have 5 days. If you have a starting date and all days need to follow (days 1,2,3,4,5) you can write a formula that simply shows the start & end date. If days can be split you can have day 1 and 2, a break of a few days, day 3 beak, day 4 and 5, this you can also have in Coda, but is a bit more complex, it assumes you keep track of the consumed days.
For this kind of projects, Coda is a great tool I believe, though I also feel that it might feel complex at the beginning. Step by step could mean that you create budget tables and project tables and make them talk
Hope it helps a bit, Christiaan