Nelyn & Élyn
Usually I prefer to avoid inflicting my dire drawing skills upon y’all, but what the hell, I’ll make an exception this once.
The diagram to the right is my quick size sketch of the aforementioned Nelyn-class modular cutter (in blue) and the Élyn-class modular microcutter (in green).
As you can see, the Nelyn is the big one, inspired by/a harder version of the Traveller RPG’s modular cutter; an interplanetary craft that’s the workhorse of the Empire; 8 m in diameter, and 48 m long in total; an 8 m main hull at for’ard for the flight crew, the 16 m module space; a 4 m engineering hull for sensitive machinery; and the 16 m propulsion bus at the back. The module space is bridged by three trusses 120 degrees apart, the dorsal one of which is split in the middle and folds back to allow module swapout. And there are lots of different modules for pretty much any purpose you can think of.
The Élyn is the smaller one, only 4 m in diameter and with a 6 m hull (including engines), optionally taking a 6 m cylindrical module in a rear-mount. It’s strictly a local-orbit craft without interplanetary capability (although it is capable of take-off and landing on many planets) – but the reason it’s drawn where it is is that there is a Nelyn module specifically designed as a cradle for the Élyn, letting an entrepreneur with the former make pretty decent money providing a taxi service for the latter on long trips…