The design post mentions the possibility of using the Terrapin as a drop ship/rescue boat in heavy combat situations. Without seats/straps to hold any additional passengers down, how do you see this working?

There are different degrees of customizability in different ships. For example, the Retaliator has modular spaces that it usually uses as bomb bays, the Vanguard has a drop-in, drop-out crew/escape module, and the Cutlass has an interior with hardpoints that can accept different types of equipment. While the Terrapin's interior isn't modular, we may find a way to play with the interior and allow for the installation of a few jump seats. Remember that the Terrapin wasn't specifically designed for this role, but the military found it useful for the situation regardless, even considering it wasn't part of the original mission profile.