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« on: September 26, 2019, 02:34:24 am »
This thread's been here a while so you've probably already found an answer, but just in case you haven't, I'm pretty sure that Ctrl+J is a hotkey that instantly joins all selected meshes into a single mesh. It should maintain textures and UV maps too, unless you mess with them after joining your meshes.
Just go into Object Mode, press A to select everything, then Crtl+J to join.
Make sure you save before doing this, because as far as I know it's not reverseable (and I may also have the hotkey wrong, lmao! I'm in class rn so I can't check until later).
Regarding the texture issue, I'm not entirely sure what's causing that. I've never had an issue like this before. Maybe something about the way you're joining them currently is messing with the UVs? Maybe try reloading your textures and see if it helps. You can also check the UV's shape by selecting parts of the mesh in edit mode. They'll be stretched out or in funky shapes if the maps themselves have gone bad.
As last resort, you can always redo the UV mapping. That's going to be very tedious though, especially if your mesh is made of 30+ pieces and you're hoping to put all those textures on one image.
btw, I primarily use blender 2.49. I'm very sorry if any of this info isn't accurate for 2.79.