@dadgametime [image: b41d8f7b-0fc8-489d-9d9b-88e7454a1ddf.jpeg]
Sorry for the late reply. Haven't been flying the RJ for a while since I experience a bug with it that renders it unflyable BeyondATC. I also haven't uploaded the livery, as it's not quite done, and I probably wont finish it until the plane is updated and I start flying it again.
I have not attempted the QT, but this is a 100. I seem to recall I ran into similar issues with the pink checkerboard textures during my paint process. I believe I determined that that happened anytime I "borrowed" a texture file from another livery as a sort of placeholder for my own livery. The engines always showed up fine. Are you overwriting existing albedo files to make your own, or building them from scratch?
I'll walk you through my own process (and my apologies, it's been a while). I had very few guides, just hours of trial and error.
I imported the model into blender using gltf tools found on flightsim.to. It was a 2020 tool, but works fine. I believe the blender model was even from a 3rd party free blender paintkit on the same site for the BAE. I added base textures in texture painter mode, matching the resolution of the other livery files. Maybe there's a better way to do it, but I painted it piecemeal like everything was a decal. The cheatline is a decal, the "airwave airlines" as a decal, the black sections. I made all those "decals" in photoshop, then imported them into blender, where I stenciled them on.
I saved the individual files for the front, middle, aft, and tail sections from blender as pngs, naming them to match exactly the same as other liveries (BAE146_EXT01_300_ALBEDO). I then threw these into the "Image to MSFS KTX2" tool also found on flightsim.to. Copied all the products from that into a skeleton livery folder structure in community. Once in the community folder, selected all the textures and dragged them onto the MSFS layout generator exe (again flightsim.to) so it generated the proper files.
Not sure if this will help you at all-- could be a QT specific issue. But I did get the pink checkerboard only after I removed all the files from the folder structure that I didn't create myself.