This has me so excited I sat down to build a Firefly as it would be if it was a ship in the 3rd imperium!
And then I thought Hey, what if I tried it using tech a little closer to the Verse's? Luckily there's mention in Starship Operations Manual that... "Some rockets have an ‘atmospheric mode’, wherein they hook fuel scoops to the reaction drive and use air as reaction mass, usually heating it before expelling it. This doubles the cost of the reaction drive, only works within a thin or thicker atmosphere or a hydrosphere and requires that the spacecraft have fuel scoops." which is how things are described in the verse. For the Pulse Drive I decided to basically keep it the same as a J-drive, but I'm imagining it probably uses the 'Real Space Transit' rules from Companion, and instead jumping several parsecs it goes several hexes instead, whatever the hexes on this map are. I was wondering if I needed to make Pulse Drives a little more powerful in general, but looking at this, it makes the jump from Persephone to Jiangyin in three weeks, which is about how long Mal took between eps 4 and 5 .
As I was building though, I ran into some trouble underestimating how hefty atmosphere rockets are. The 400ton ship chassis doesn't have room for them, even when I was cheating in reduced tonnage (which isn't normally available on r-drives). It was so bad I had to upscale the whole ship to 500 tons for the verse version. Luckilly that also gave me just enough leeway to have reaction-mass fuel tanks large enough that the ship could cost a whole extra hex on them if it was trying real hard, which really helps get over some of the 3-hex gaps on the verse map.
Designing ships with verse tech in mind is a really interesting design challenge. It's a shame things don't line up clean enough you can just use a 1:1 translation, but I suppose there's nothing stopping a Referee from just playing loose and sloppy with a 3rd Imperium ship in verse space for the sake of the story, haha.