To build the lighthouse you need the Lighthouse Build set and the Invisible window and door set. Don't forget the collection files! The meshes will not clog up your catalogs with stuff that is not used very often. They will only appear in the collection files. 1. Make sure you have a flat piece of ground of at least 7x7. Build with normal walls a shape like in this picture. 2. Place the round wall segments agains the walls. You place them on the inside, they show up on the outside. You can use either the normal ones or the one with windows in it. 3. Place the wall segment with the door opening. 4. Use the invisble window on all maxis walls (except for the dooropening), so they will "disappear". 5. Place the door with the arrow pointing to the outside of the lighthouse. 6. Fill the floortiles inside the maxis walls. 7. Use the "floor ring" to cover up the unfilled floortiles. 8. Repeat these steps for as many levels as you want your lighthouse to have. For higher levels you may need to first place the floor tiles before placing the wall segments. 9. On the top level you can place the spinning light (needs Nightlife). You might need to use moveobjects on to place it. 10. Place the top part at the top. 11. Your lighthouse is ready! You still need to place the stairs. For that you can use the modulair stairs, in combination with a foundation (use the lower floor ring if you have a foundation part in the middle). Or you can use some custom stairs. Spaik made some fantastic 3-tile stairs, which will fit in perfectly in the Lighthouse.