Having built many cars myself - all 100% hands on.... I can tell you that there just is no setting drop dead dates that make sense... EVERYTHING takes way longer than you think - there is no reasonable way to foresee many of the issues... and if you want the thing RIGHT - then it just takes time.
Having said all of that... the main issue is that they're most likely working on something else... so that's the issue I would push with them - nicely - is that you want people on it and you want them to stay on it.
Biggest issue - if you're "all paid up" - you have no leverage... and they'll work on the latest project that needs to have some cash flow generated.
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