Very nice link, thank you. Yes, building anything on the Moon won't be easy. Let me just add here some other obstacle not mentioned elsewhere: you can't build

Very nice link, thank you. Yes, building anything on the Moon won't be easy. Let me just add here some other obstacle not mentioned elsewhere: you can't build a "spaceport" on the Moon. Every lunar landing will result in lots of debris flying at bullet speed for kilometers without any air to brake it. More precisely, some of the debris will acquire escape velocity, some less, so some will end up thousands of kilometers from the landing site. But that doesn't mean solutions can't be found. I personally envision a telescope being covered by a dome with retractable foil layers. During the day, when you face the unobstructed Sun (and the solar wind), you cover up. You use several concentric shells, with a small pressure differential between them, so any small (or large) hole causes only a small leak, rather than a catastrophic rupture. Inside the inner shell you have some atmosphere to help you deal with dust, but it does't need to be 1 atm, it can be 0.01 atm, for example. As the foils get punctured by micrometeorites or the aforementioned particles kicked up at landings, you repair them and ultimately replace them on some rotating basis. If regular airlocks can't fully deal with the lunar just, use multi-level airlocks. Etc, etc. I think pretty much all the problems will have solutions. The only question is what benefit we get out of it, apart from the vague desire to colonize the space? Andy Weir in Artemis only thought of tourism, and (no spoiler) some other application that seems quite unlikely. I personally think telescopes are a better business proposal. I did not think of all the details, but since you ask, I think a mobile package would be a natural first step, and then if it works, a modular solution would be a second one. Many years later, we could end up building the instruments themselves on site, but until then, we'd probably need to bring them from the Earth.