I don't know if there is any canon description of warp drives. The one that featured in the old Bloodquest comic was rather silly to my tast. So this forboding piece of enginering you've come up with is the best guess I've seen to date
More importantly, there are endless techs in the 40K universe. That vessel could be something lost tens of millennia ago, or alien beyond comprehension. There are few, if any, hard and fast rules in 40k. Look at how fluff has changed just between Rogue Trader and now.
When will someone make a crossover with the StarTreks with their Warpdrive being the very ineffective form of leeching a pure demon (the core) of it's powers. And without gellarfield they can't get even near the true speed (above Warp 10)
Difficult per sé? No. Harder than your run-off-the-mill Naruto-ff? Yes. Most seem to forget that the whole time 'The war in heaven' was only technological. And THEN it all coes pinoccio and shit's getting real.
A gorgeous image to depict something I've never really thought about - what a Warp Drive looks like. Oh, sure, there are tons of images showing Warp Drives being used or destroyed, but the actual drive itself? This is a first. Kudos! PS: And yes, I know. Buckle up your Purity Seals, it's gonna be a bumpy ride...
Well, considering how most buildings and devices of the Imperium are made it is no great stretch of imagination to think that something as powerful, important, dangerous, and above all, secretive (at least when it comes to their construction) would be made to look like something between a light house and a gothic cathedral.