Although megastructures exist in the SW canon, truly stellar feats of engineering seem to very rare or non-existant. Examples that spring to mind are matrioshka brains, McKendree cylinders, topopolises, ringworlds, Alderson dics, supramundane shellworlds and discworlds. Yes the Deathstar counts in some manner as a shellworld/megastructure - but only two were ever made and required all of the resources of a Galactic Empire to make (discounting fact that the Empire in SW doesn't control the sizable Unknown Regions). So I think the Deathstar(s) are the exception to the rule. Ditto stelasers, which although the Deathstar has, they are not as widespread as you would think. Then again, you don't really need giant batteries of lasers around a sun pushing freight around if you have the propulsion systems of SW at your disposal. The mother of invention is necessity, after all.
SFIA discusses a lot of interesting projects that you can do with blackholes and stars, that for some reason SW doesn't touch. Either this is due to the ignorance of the writers or technological limitations (my bet is on the former). So you don't see starlifting, (that I'm aware of), stellar-engines or blackhole farming/colonization. We'll ignore for the moment that some blackholes in the canon are actually the homes of extradimensional beings that eat the force (I can't remember exactly though).
Lastly, as far as I'm aware, nanotechnology is rather scarce writ large. Yes it is utilized in medicine and weapons/armor, but I've never seen it deployed en mass as grey goo, or angelnets (that is, smart-matter blanketing an entire world for the good of all). An interesting thought is that the Force is in fact a type of nanotechnology, but SW canon somewhat disproves this.
I'd like to point out that I'm not a SW scholar or anything, but I'm passable familiar with SW lore and technology, beyond the levels an average fan might have.