It sounds like you just need 2-3 years of living expenses for ages 60-62, minus the 10,000 in side gig money. After that the pensions will kick in and cover all but $300 a year, assuming they are inflation adjusted. Then as your side gig winds down, you'll be able to file for SS to replace it. Here's how I would break it down in non-inflation adjusted numbers:
Age Expenses Income Shortfall
60-61 35,000 10,000 25,000
62-67 35,000 34,700 300
67+ 35,000 40,300 -5300 (this is an overage)
So for the first 2 years you just need $25k a year. At a 4% withdrawal you would need $625,000, but that would allow you to withdraw that extra $25k every year in retirement. Do you want to increase your lifestyle that much at at 62, or would you be ok with spending the principle to fund the first 2 years of retirement and starting with a lower retirement account balance? The other option would be to leave it as an inheritance, or some combination of the above.