This is "leaning into the weirdness of docking the Ship's Boat sideways".
A safer assumption would be a
null-g gravlock type of arrangement (inside of which there is no "down" direction), where each respective craft has their own internal gravity nadir orientation, but between them (when docked) there is a zero-g microgravity zone allowing crew/passengers/cargo to be reoriented for transfers between the two craft. Such a feature could be styled as part of an airlock on the starship side, but doesn't necessarily require atmospheric pressure cycling in order to operate. Being able to combine airlock and gravlock into the same feature would be ideal, of course.
An even more ideal arrangement would be an airlock/gravlock for the crew access airlock behind the bridge of the ship's boat (the reason why the boat needs to roll 90º in order to dock) and have the payload bay door just open directly into the cargo bay for cargo transfers (the cargo bay could be set to zero-g or microgravity during the transfer). Under those conditions, you would ideally want to be able to "load" the G-Carrier into the ship's boat for orbit to surface transfers ... except the G-Carrier is stored on the dorsal top deck as far away from the ventral lower deck as possible, making a grav lift structure to transfer the G-Carrier through the hull for loading into the ship's boat as impractical as possible.
To be honest, the G-Carrier ought to be loaded into the ship's boat by default, with the option to move it into the cargo bay if a "switcheroo" is needed to transfer other cargo contents using the ship's boat.
To be even more honest, I'm of the opinion that a better "fit" would have been a 50 ton Modular Cutter, with the G-Carrier loaded into the module, instead of a 30 ton ship's boat plus 8 ton G-Carrier (38 tons). Doing that would reduce the cargo bay size by -12 tons, but you would have a far more capable combination of craft. The only advantage the ship's boat offers is 6G performance, which is "nice to have" since the Type-T is a 4G starship ... so the ship's boat can operate as a "pursuit craft" (of sorts). The problem with such an approach is that a ship's boat makes for a remarkably lousy fighter combatant, poorly suited for the pursuit role. There's a kind of "dog catches car" feeling involved when pressing an unarmored ship's boat into the role of being a fast fighter. Sure, the quarry can't escape from you easily ... but as an unarmored small craft it isn't that difficult for them to disable your ship's boat either (assuming the target has offensive weaponry).