Having watched a few videos (including a flip-through of the book in which I used the pause button judiciously), I now believe my hopes for Stargrave have come true. It's heavily modified for sci-fi, but still the underlying Frostgrave system with which I have become familiar. That means the fantasy bestiary sections of all my blue and green Frostgrave books are just waiting to become alien critters with a reskinning.
Also, I'll be using Perilous Dark to help me create the cherry-picked mix-match of all my favorite sci-fi settings into my own Stargrave galaxy. I look forward to scrabbling through the rubble of the war between the great Gothic Grimdark Empire and the Cybertech Corporatocracy in the hard-luck frontier of the Outer Rim, where ancient ruin planets are just as common as the war torn frontier worlds where Old Earth Atompunk Americana was in fashion right before the bombardments began...
I'm also scheming how to adapt Mantic's Plagued in as a custom set of baddies to replace the Space Pirates in certain regions. I'm looking forward to finally getting use out of my dragon's hoard from the Deadzone, Warpath, and Star Saga kickstarters!