But this would be in the future though, when I can find a good crew for it that is interested.
As far as having a team goes, a lot of indie films just hire one post audio person to do everything, and it seems to turn out fine. One of the movies I helped to make, has pretty good sound effects audio, and it is all being done by one person. But when I saw 24 inspired I do not mean as high budget as 24. Think of a microbudget version of 24. Kind of like El Mariachi meets 24.
Ok.
Here's the thing. Reading your brief outline above, you could, in theory, make that movie for $5million or less. Too much less and you are running into some serious hurdles. Insurance, E/O, medic on set, weaponsmith, and other
absolutely essential safety costs that you absolutely positively cannot skimp on what so ever will add up fast. I do not have enough budget experience to give you an example number; however, having worked on features in the SAG "ULB" range I have a little experience with what can be done with small amounts of money.
IMO, Anything less than $500K and a project like this would suffer greatly and the end product would likely not be worth the investment.
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I'm not saying it's impossible to do for less. Hell, it's possible you could make that film for $20K, but you would not be making the film you are imagining it to become.
Keep this in your pocket. Work on your skills and your contacts. Who knows, maybe you'll meet someone who likes the script and just wants to buy it off you and produce it. Selling a script is just as baller as making one.
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Also, really get El Mariachi out of your head. There's a pod-cast interview with Shane Carruth that was posted here on the board. He talks about how trying to model the production of Primer after El Mariachi kinda (in his retrospect opinion) screwed him over. El Mariachi was made in an entirely different distribution and production landscape, decades ago, in a country where at the time when the local currency was worth pennies in comparison to the USD. In addition to that, when people say "$7K" for the production, that is not an inflation adjusted number.
http://www.bls.gov/data/inflation_calculator.htm
Figure the inflation adjust number to be ~11K.
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For reference. A friend of mine is starting filming on his feature and has about a $50K budget. He's doing a "coming of age" kind of story with very limited locations (2/3 or more of the film is in one house), extras pulled from friends and extended family, and had to rewrite the entire thing to be during the day instead of evening (centers around a large extended-family gathering) because the location he could afford would only allow him to shoot 7a-7p. IIRC they are looking at ~25 total days of shooting. That's about what one can accomplish with that amount of money and have any expectation of a distribute-able end result.*
* - YMMV, exceptions to the rule, story is king, mumble-core, yadda, yadda, etc, etc, disclaimer infinitum. We're trying to help H44 in a
realistic way here, so please, let's avoid the inevitable debate about outlier hits. We already have that thread.