I don't think so. Technically the plan outlined there is feasible, but the problem is getting there.

Flying that close to the sun would multiply the radiation problem considerably. Then you'd have to land and drill underground and build enough to get a foothold before you died.

Finally, there's the fact that you'd have to live underground. You could never really live on the surface.

For Venus, yes, you could float around in the atmosphere, but where would you get raw materials? The surface is too hostile to mine.