Event-based spawning

Hi!

This is really an architecture / pattern issue... don't know where it belongs. I hope it's not misplaced or a "what kind of ice cream do you like"-type question. If so, please feel free to ignore me =)

I'm trying to set up an event-based spawning of various objects, and I'm looking for a clean way to do it. I have a class (non-MonoBehaviour) that holds the 'blueprint' for the object to be spawned. I have lots of instances of that class, so I like that it is NOT a MonoBehaviour, 'cause it keeps it clean (should use a struct, maybe...). Then I want the game engine to fire events, carrying the game state (an int called 'height'), triggering callbacks to instantiate based on the blueprint.

My challenge is to do this in a clean way. Right now I'm nestling the classes in a kind of ugly way, which I would like to avoid if possible.

So: can I do this in a way that keeps the ObstacleSpec ('blueprint') class free from any logic, thus separating creation from blueprint? Or is this code actually fine, I'm I just whining?

The code works, it's just that I feel it could be done alot better. I do kind of understand events and delegates and that stuff, but I'm hardly a pro... Any thoughts greatly appreciated!

My code is (basically):

 public delegate void EntryEventHandler(int height);
 
 public class LevelBehaviour : MonoBehaviour {
 
     ...
 
     public event EntryEventHandler Entry;
     protected virtual void OnEntry(int height) {
         if (Entry != null) {
             Entry(height);
         }
     }
 
 
     //This is called from a game engine singleton, at the appropriate occasions... No trouble here
     public void performLevelActions(int currentHeight) {
         OnEntry(currentHeight);    
     }
 
     public void Spawn(ObstacleSpec os) {
         Instantiate... etc, i.e. MonoBehaviour-based operations, and set stuff based on information in blueprint
             
     }
 
 }
 
 
 public class ObstacleSpec {
 
     LevelBehaviour levelBehaviour;
     int entryHeight;
 
     //various other properties
 
     public ObstacleSpec(LevelBehaviour levelBehaviour, int entryHeight, ...) {
     
         this.levelBehaviour = levelBehaviour;
         this.entryHeight = entryHeight;
         this. ... = ...;
 
         //Subscribe to the listener, REALLY want to avoid referencing LevelBehaviour from inside ObstacleSpec!
         levelBehaviour.Entry += new EntryEventHandler(PerformEntry);
 
     }
 
 
     //REALLY want to avoid referencing LevelBehaviour from inside ObstacleSpec! Can I move this outside, somehow?
     void PerformEntry(int height) {
         if(height == entryHeight) {
             levelBehaviour.Spawn(this);
         }
     }
 }