Depending on how much you're rounding down there-fairly easily.
Huge hull, maxed miniaturization, my hyperion shrinker built, no other races' shrinkers taken, 322 space. 320 cost for the huge hull, 23 * 160 cost for the nightmare torpedoes. Total cost: 4,000BC. (Total rush buy cost: 55,002BC)

And if I wanted to for some reason fill up a ship with hp modules (integrity grid or organic hull plating, your choice) at 77 * 60, plus 320 for the hull, plus 160 for the single nightmare torpedo that will now fit, I'd be up to 5,100BC. (Total rush buy cost: 71,856BC.) While this is obviously non-optimal, it does show how hp modules can fairly drastically increase the cost of a ship.
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Also, Willy, we're talking build cost, not rush buy cost. 