Princess Elizabeth’s Space Marines gaming league?

Does anyone have any information about the gaming league described in this recent post on Reddit’s r/DungeonAndDragons?

Back in the early 2000s, a coworker used to be involved in a game league that used [styrofoam packing inserts as dungeons]. It was called something like “Princess Elizabeth’s Space Marines”. It was not Warhammer, it was some ad hoc wargaming thing that people were playing in the mid atlantic and northeastern US during that time. I have never been able to find documentation about it and I might be misremembering the name, but they primarily used these as their dungeons. Now I’m going to go into a google rabbit hole looking for this for hours. I never got to play but he had tons of pics of the games they played.