Have you tried mounting the plate on a non-weaponized turret?
Steps:
1. Build a turret rotor block at the point where the angle rotation is centered (or close to it), pointed in the direction of the rotation axis.
2. Build a docker into this rotor and add a core as if you were making a 2-d rotation turret.
3. Build an armor plate above all this. (Note: Do -not- add a Bobby AI block, but feel free to add a Faction block)
4. Exit build mode and enter the turret-plate's core to pilot it.
5. Manually pilot the plate into the correct angle.
6. Exit the core and re-enter build mode on the mother entity.
7. Build blocks around the rotated turret-plate to keep it at the current rotation.
8. Avoid using the turret auto-alignment function. (This is why a lot of builders would simply like to have a free-rotation block, similar to the turret block; to avoid re-alignment problems, while being able to reset all their turrets to the "home" position.)
9. Hope your ship doesn't get banned by the admin staff for being a potential lag bomb.
I'll be completely honest, this is a solution that did pop into my head, but one I quickly discarded as I don't like needlessly using docked entities in such ways where it isn't necessary, due to the slight amount of added system strain. I'd rather spend the extra effort to hammer out the level surface by hand. The only real problem is just figuring out the pattern to make it fit the angle correctly. Thank you for the suggestion, though!
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you could try using slabs as gradients instead on certain parts. can be very effective. maybe wont help with some of the weirder angles, but its an additional option.
edit: been trying to find a ship on the CC i saw that was a good example, but cant remember its bloody name.
Using slabs is certainly a solution in /certain/ circumstances, but in this specific situation, it would not be a solution that works well (large ship, and this is an angled plan next to planes at other angles, and I'm wedging everything I can). Thank you for the input, though!