This project would likely take about 3-5 days at a few hours a day after work for an experienced engineer, including video editing, plus shipping time, and random research here and there on a phone.

It could also be done much faster, but then it would start to feel like work.

The cost could be closer to $50 to someone who had the tools.

If you're willing to use leaded solder paste it might be even cheaper and easier, but I'm sure as heck not.