And here's what that means in terms of fixing up the nebula to be able to catch those incoming criminals adequately:
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The project planetoids are the real destinations for the criminal types -- all three orbiting dwarf stars within the supernova effect zone, each has acquired plentiful exotic-element lithosphere components. On two, the convicts live out their lifespans in happy, satisfying, productive labor, scraping the surface with low-powered bulldozer-style scrapers. In a mere five or six centuries significant piles will have been stacked up. By the time the nebula's dispersal has diminished to the point it's less effective as a prison, some 1.5 to 2.5 millennia hence, most of the good materials will have been made available for harvest. Galactic governance *does* take the long view.
The other planetoid (pp2 as illustrated) has been provided with a rudimentary oxy-nitro atmosphere, and convicts of that lung type are doing their scraping in pleasant, bucolic surroundings, under the open sky. Pleasant if you enjoy bare stone and lichen, and small seas of sludge, but hey, they knew the odds when they committed raszenariation, or kidnapping, or murder.
How do basically unpowered droneships arrive at tiny specks within a vast catchbasin volume? Well, when a spineship stops in a nebula-effect "crash", the original pseudovelocity only gradually bleeds off. If applied to the right spinetips, said caught ship can be vectored anywhere within a light-year or so, giving the automated systems of these convict-carriers the ability to home in on the destination planetoids. For the two without atmospheres, arrival is analogous to docking, and the accumulating set of drone shells becomes the habitat for the residents. For the one that's had atmo added, the spines can be ablated sufficiently to allow a reasonably survivable landing, particularly if the sludgelakes, er, seas are targeted. Again, the ship shells are then used to provide accommodation, tools, and base material for sustenance-synthesis. The sustenance dispensers are tied to scraper-output on all three project planetoids, hence motivating the inmates to produce.
Next step - stitch these into one map sheet.
