Just need acamera clothto block the light (cloth hood as we used to with the old veiw cameras to cover your heads and camera) so I can see the LCD in thedaytime.
Aha, here's another chance to exhibit my greatest photographic invention, using readily available materials. One like it is still in occasional use on my little Casio pocket digicam. You can hold it in place by pressing one end against your eye socket and the other against the camera.
You'll need kitchen roll for your nice big dSLR screen, rather than the core from a toilet roll as here. I have mine wrapped in parcel tape for durability, and it squashes flat to fit even into the small case I have for the Casio.