Heck, runabouts have a jeffries tubes running under the deck between the forward and aft compartments. I think it was Blaze of Glory we saw one them?
The Delta Flyer is a large shuttle, the runabout is a small ship. Most ships couldn't carry them at all, and I think it's almost a bit dubious even with the pregnant belly that the Armitage class can carry four of them.
To paraphrase J. Michael Strazinsky, either might be larger or smaller on any given day because they are both the size of plot!
The Foundry Roundtable live Wednesdays at 7:30PM EST/4:30PM PST on twitch.tv/thefoundryroundtable Forum Logic dictates that if the devs don't do what a poster wants, they therefor actively hate what that poster is advocating for. Forum Logic =/= Real Logic