@imsak,
Firstly, there's nothing wrong with them grammatically. However, if you were having a conversation, you might say them a little more simply.
Quote:- How much money is needed to make the completion of our project more likely than not?
- It seems less likely than not that he will arrive on time.
- It is more likely than not to be raining tomorrow morning.
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I would say (or write) them more simply this way:
"How much money is needed to make the completion of our project more than (or most) likely?"
"Most than likely he will arrive on time."
"It's likely (or more than likely) to be raining tomorrow morning."