: The only way to make structures invisible is to use map-specific locations,
: like in Erosion's Grifball area ceiling or the top of the space base on
: Impact. Large objects merged into certain spots of the maps geometry will
: become invisible.

: Like, a 1x1 block? Doesn't work. They will only vanish if the Extraction site
: times out, not if it is captured.

I remember you demonstrating why Extraction was useful and I think you said some objects besides the Extraction crates will work for that, right? Going away on capture? Wasn't it just anything destructible? That would mean you should be able to link it to Extraction crates, vehicles, explosives (fusion coil, land mine, fuel can), wooden pallets, and maybe one or two other things, which should be enough for a small structure.