[@Sophrus] By cargo ship, do you mean something like the Arvus Lighter? Crewed by a single pilot, it has a max speed of 1600 kph (barely breaking mach one) with a maximum travel distance of 22,000 kilometers in atmo. and a capacity of 16 people. You know, the kind that is not only not warp capable, but also wouldn't be able to travel between planets, and is thus useless to our needs?

Or something like a marauder bomber? Also able to be piloted by a single person, its max speed is 1800 kph (hstill less than mach 2) mach range of even less than the Arvus, and equally not capable of warp travel or even interplanetary travel.

The next step up would be things like interceptors, which still have the problem of not being able to move between planets.

The next step up, literally the smallest step you can take, is freighter class. With crew sizes in the 10k+ range, we come back to where we started.

Do you see the running theme of the problem with taking your 'smaller ship' idea? The Firefly universe, this is not. In 40k, you need to hit five digits worth of crew (for HUMAN vessels) before you can go anywhere. That's why the ship Urgrugg showed up in was such an amazing oddity, yet still existed as a failed proof of concept despite doing something that basically can't be done.

Edit: [@Wraithblade6] JB Started all of this. He assigned me to do it, because I asked him to. It was his post that sent us towards more NPC interaction fun-times. It was also his idea to go get aboard another craft, despite the fact he made up some random, non-cannon ship that can't exist in 40k, yet decided for whatever reason not to make it at least capable of interplanetary travel.

And, no. The machine spirit would not accept us. It's a computer, they don't do that without being hacked. If anything, If it identified the ship from imperial record, they'd identify us as a, wait for it... Emperor's Children vessel, and blow us the hell up!

Edit 2: Also, before this goes any further; I had no intention of taking the entire ship with nothing but a huge battle spanning the entire ship, leaving nothing but bound survivors behind us. The plan was to have us hit the enemy ship close to the main deck, find and capture the captain, then convince her to direct the rest of the ship to flee the battlefield in exchange for return of the soul stones. We'd end up betraying them along the way, but that's step 2.