@TaxiService: No, you never uploaded the .psd. I manually recreated the image by copying the image from the Moke thread and pasting in my own stuff, adjusting the frame borders as I needed. It took a surprisingly long amount of time! If you have the .psd I'd greatly love to have it.
Ship has been finished! View the thread here.

Here's the hull of the Lux Tempestas. She's a hue-shifted recolor+minor edit of the Skyburner, a ship made by the community of Battleships Forever.
Original Skyburner Thread
I believe the policy was "anyone can use these hulls as long as they give credit, as they are a community creation and belong to no one in particular"--so...yeah, here's credit given.
One of the bigger changes I made was splicing in the rear spines of the Arms Fort Asmodai, by SilverWingedSeraph of the Battleships Forever forums.
Arms Fort Asmodai. Large image; right click to view in full.
I tried to contact Seraph and see if he was okay with me using bits of it; however, I was unable to reach him. After some deliberation, I decided to go ahead with it, on the rationale that he never used it in one of his Battleships Forever mods (his computer crashed and all that remains of the Asmodai is the single image, with no data associated with it). However I'm quite aware that that's iffy territory, so if by some chance Seraph comes along and files a complaint I'd be happy to remove those spines.
The small changes I made were adding a black pixel outline around the hull, removing some of the fiery glows/flamethrowers, removing the back engine block and adding a more standard FTL engine in its place, and cleaning up some of the pixely/blurry artifacts around the edges, particularly around the spines. (Removing a white-outlined black spine from black space was an interesting experience, to say the least.) Oh, and of course, the recoloration.
The Grand Cannon is actually an edit of the Sweetwater Handcannon, a cannon from...Maplestory. Yeah...
there's the weeaboo side of me showing...
The image itself was extracted using Mapleme.net, a Maplestory character creation/simulator thingy. It basically rips images from the game and lets you move them around yourself. It's the successor/competitor to Bannedstory, whose image creation was explicitly allowed by Maplestory proper, so I guess the cannon is fair usage??? Anyway there's credit where it's due. It's not like Maplestory would sue over this one free ship mod.
I hope.
The Radiant Stormcannon, weapon strip. Abbreviated as Grand Cannon.
For comparison, the original Sweetwater Handcannon, shooty end facing left.
The problem I ran into when using that image is that the perspective is wonky. FTL weapons have their top edge over their bottom edge, whereas the original sprite has its bottom edge extend beyond the top edge. (Look at a vanilla missile launcher and you'll see what I mean.) So I flipped the cannon and removed some of the fiddly bits to make it look more like a beam projector.
As for what the actual weapon does, it fires a beam of white light that slowly sweeps across enemy ships. It's a 4 power 2 damage beam weapon with 22 second charge time. Although it's got a long trail and a 10 second stun, it's also really slow, and requires good shield suppression to use effectively.
Wow, damn near wrote an entire thread writeup on this ship already! Again, the only thing missing is gibs, but my computer's on the fritz so that may be a while coming. Fortunately I backed up all my data the day before the computer died; the trouble is just finding a good public computer to work from.
EDIT: Actually, one more thing!
You may notice pink stripes that say AIRLOCK on the rooms that are, well, airlocks. You still can't add floor art to empty rooms, so what I did is, I made the door image really big, so that the airlock strips would clip through the doors image and into their proper locations. Images are added top-left-corner to top-left-of-room, so it's pretty easy to visualize the other rooms you want to clip into.
A neat little idea, IMO, and something that could add more flavor to ships.