@CeciliaZ Hi, Cecilia! There are 4 "pegboard" holes drilled into the Loft ceiling. If you look at the 2 sets of perch holes drilled into the bottom of the Medium Wingdow Seat you have, the holes drilled into the Loft are spaced exactly the same way. So, you can hang things directly over the perch of your existing WIngdow Seat---or recess them 1" either way. And, the same perch assembly we use for WIngdow Seat fits right into the Loft holes. I've had a couple of people ask me to drill a 5th hole smack in the center of the Loft ceiling---which I have asked my plastics guy to do on the next production round--but the ones I have right now are 4 holes. The way the holes are spaced now, the toys (swings, etc.) would hang a bit to the right or left of the center of your WIngdow Seat perch---and not right over the center where your bird is most likely to sit when using the Wingdow Seat. If you like, I can take a photo of one of the Lofts I have here---with toys hanging out of the 4 holes we have drilled in the Loft---so you can get a better idea. As for the perch that's shown attached to the ceiling in the Loft pic of the Cockatiels---that's a 3" high perch---but we can put any size perch you need. It all depends on the bird that will be using it---and the amount of "head room" they need (as opposed to "tail room" when mounted to the Wingdow Seat bottom). 3 inches should provide enough head room for a Cockatiel sitting on one of the Loft's upside down perches---but we can also make it 4 or 5 inches if they are flighted and need more room to land. Also want to mention that you can mount a perch ABOVE the Loft, too---and you still have 2 holes left for hanging toys underneath the ceiling and above the Wingdow Seat. I think I need to take some more pics to show the versatility. It's kind of a Leggo block. Hope this helps!