The 'Mellotron' sounds exactly like the real thing?
I cannot even tell what the sound is supposed to be - almost a cross between the Popol Vuh 'Choir Organ' and some sort of string synth.
Well, I'm sure to him, it sounds exactly like the real thing.
But he's unknowingly way off trying to copy Yes' Mellotron sounds.
It seems his reference point is how they sound on Yes CDs. If he saw and played the actual Mellotrons they used, he'd have a completely different reference point.
With the exception of Fragile, those sounds were re-equalized for use in the double Tron. They're modified stock sounds.
Of course he couldn't know this, so it's understandable he'd think he had the perfect Mellotron emulation.
He deserves points for the visual part of it, but ultimately it's the sound that matters most. In this case, the eyes are used to fool the ears, so visually - he's done a great job.