This is exactly what has been done for the P-8 [1], it is a 737 with a bomb bay.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Boeing_P-8_Poseidon" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Boeing_P-8_Poseidon</a>