My MOC of a Laysan Albatross (Phoebastria immutabilis), scale is roughly | 1 stud : 1 cm | of an adult bird, give or take a few cm.
The model is about 34 studs bill to feet and 84 studs wingtip to wingtip when not folded at all. The axle holder on underside of the bird should be near the center of gravity, but depending on what size axle is used to brace the model, the inside may need to be reinforced a bit, or you may need to have a tripod-like base for the axle.
To say this isn't inspired by the work of Thomas Poulsom would be disingenuous at best and an outright lie at worst.
The model was first built in Stud.io and then went through several revisions of the physical model. The provided .io file reflects the final physical model. The instructions also reflect the final version. All parts in blue can be any color - they are not visible.
The only part I'm not completely happy about is the eye - the bird should have a dark patch around the eye, but that was near impossible to do with the way the plates are stacked on the face. I also know there under-wings should have some dark pattern on them, but that was simply too difficult to do - adding more (smaller) plates would make the wings too fragile to stay together. Overall, I'm pretty happy with it.