In TAS, the ship would have to be larger than 947 so I have no problem scaling it up. That might allow you more leeway. Or, in terms of curved halls, you can do as Masao did with the WASP and have the circles ring around the secondary hull vertically.
But a hailstone set in as you have it could make sense in that it leaves empty space for fuel and can serve as a radiation shelter.
Keep up the good work.