Some information relative to the Mercury temperature/metals question:
“It is understood that the sunny side may reach temperatures of 750 to 800 degrees F., [400-427 degrees C] while the night time temperature plummets to nearly -330 degrees F.”
https://www.weather.gov/fsd/mercury#:~:text=The average temperature on Mercury,we observe from the Earth
Mercury's surface temperatures are both extremely hot and cold. Because the planet is so close to the Sun, day temperatures can reach highs of 430°C..
Iron/Melting point 1,538 °C
The melting point of steel ranges from 1371-1540°C..
Seems iron/steel would be OK, but a lot of plastics might melt.
At a standard atmospheric pressure (1 ATM), blood boils at approximately the same temperature as water: around 100 degrees Celsius, but of course at the lower atmospheric pressure on Mercury would considerably lower the boiling point. In any case, even taking this into consideration blood would boil on the sunny side of Mercury. Robots would be essential, but they would have to be delivered without human intervention. Including humans on the ship would require a lot of thermal insulation.
Any robots used would have to withstand the huge temperature range quoted above, and the absence of atmosphere.
My estimation (imho) of any advantage in utilising the highest temperatures on Mercury would be that it would not be worth the trouble. Lower temperature sites are available, but there would still be the huge temperature differential (low temperatures during dark times) to be considered.
It might be possible to transfer energy from hotter regions, but this could be am expensive procedure, especially in putting in place.