Obviously, we are not going to see huge hotels coming up at the Near-Earth Asteroid region any time soon. The problems discussed elsewhere on these web pages are all serious, and as long as we must depend on Earth-launched materials, nothing very large can be built in Space. Until a healthy Space-based economy is functioning, there is no particular reason to build large radiation shields and habitats - there is no demand for housing there.
Now let us look at the technical realism here. The criterion usually used by most people to assess the practicality and realism of a given concept is:
"Has this been done before?" No, not exactly this, but in developing the concept we have sought and found proof of the feasibility of the key components.
In 1974, a signal was sent from Arecibo into deep space. The dish was
~305 meters. It transmitted ~20 trillion watts in an omni-directional broadcast
(2*10^13 W). It was sent for 169 sec. The frequency was at 2380 MHz and
the equivalent wavelength was ~12.61 cm.
courtesy of the NAIC - Arecibo Observatory, a facility of the NSF.Photo by David Parker.