Item is quite flimsy & so difficult to keep square. Easier to fit with two people. Check the internal measurements as well as the external external as my existing internals were 50mm shorter than this one meaning I had to remove a noggin. Also the surround is slightly translucent so if you haven’t painted right up to the edge of the opening, or the plaster edge isn’t neat, you will be able to see a colour difference even though it’s white. Same with the catch. The pole, which you have to buy separately, is expensive for what it is, but would be difficult to make up yourself. Without it you would need a chair or hop up to release the catch. Also i had to cut out two slots of the polystyrene so the ladders wouldn’t push the hatch back too far. And that was the thinnest insulation so would be worse on the other two options given.