I looked an empty platform for a while, and this was the best I could come up with at 66 tons. It needs all advanced fuel material and ammo imported, and with that singular turret at 11 research it just barely scraped its way from Nauvis to Vulc; the turret getting whack'd by an asteroid right on arrival (with a bit more damage research/quality ammo it would have been fine though). I can't think of any way to make this tinier tbh
What tiny ship designs have you guys come up with?