Reflection Probe or camera projection

Hello,
I have a scene where I need to have a 360¤ view of the exterior of a ship as if there was nothing around the room I am in, but when I get out of the room, everything is there, so I can't make things really invisible except in this exact room.

I have set up a reflection probe that takes everything but the ship and I have set up my room to have 100% reflective walls. It works, but everything is mirrored. Is there a way to "de-mirror" the textures? I have also tried to set up 6 cameras to make a square and then use them as textures for each of the 6 walls. I don't know how it would hit the performance, but one thing is for sure, I can't make it so I have 6 cameras to form a cube. The aspect ratio seems to be locked to the main graphics' aspect ratio. Is there a way to make those camera square?

Is there a better way to achieve what I want?

Thanks

ThunderMusic

 

Finally, I found my solution. I did not notice, but when I assign my render texture target, the camera changes its aspect ratio to match the render texture ratio.

Now, I have my 6 cameras set up and it does not seem to affect the performance too much for the moment (I only have a test scene with minimal assets). Each camera has a square aspect ratio with a 90 degrees view field, so 6 cameras equal 360 degrees on each side (each side of a cube). I assigned each side to a plane. My problem is, there is a clear distortion at each edge. We see the texture changing from plane to plane. I have centered my camera in relation to my planes, but it only minimizes the issue; it does not eliminate it. I use the "unlit -> texture" shader. Is there a better way to go? Should I use a cube map with a custom inverted cube (pointing inwards instead of outwards)? What are your thoughts on that?

Example of the visible edges :

Thanks a lot.