[ppaattrriicckk]

Apart from getting 16 sq. km of solar arrays and radiators into orbit - and without jumping to conclusions about whether this is a borderline scam - I can imagine 2 obvious showstoppers:

1) Space debris. This is proposal is several orders of magnitude larger than the biggest things in near-Earth orbits. Thus equally many orders more likely to be hit by, and create, space debris

2) Heat transport - this isn't my home turf, but I can't imagine building something lightweight enough to be launched, yet also capable of transferring enough heat away from the 5 GW core, without it melting/breaking

It's been a while since I read their whitepaper, but I don't recall either of those points being addressed.

[mercutio2]

LEO is the last place you should worry about space debris.

Space is just unfathomably large. If you aren’t in the same orbital plane, you’re just not going to have a problem. And if you did, Kessler syndrome in LEO is a non problem.

Could be an issue for specific orbital planes in stable orbits, but even there, it’s overblown.