noticed this and wanted to clear up a couple things here and hopefully provide some context.
there's not a difference in teams/people working in imperial or metric. all in-game measurements are 1 unit and 1 unit = 1 foot.
it does look like the energy shield FX here is improperly sized. i believe it should actually be 18x36 and not 16x32.
so on that front, we'd love if you could report that to Halo Support so that our teams can take a bug on that.
hopefully that helps clarify a bit!