I already made all the detail (Except textures) for this side, and it would be really hard to make it accurate for the other side as well. Is there any way I can take the side with the detail already done and mirror it to where the other side looks exactly the same? Any help would be appreciated!
Select it all, copy it in the red direction with Move/Copy and then, while the copy is selected, right click on it and choose Flip Along>Red Direction. Finally, bring the copy over to the original with the Move tool.