Steven Wilson of porcupine tree (& opeth prod.)

Being a huge fan of Steve Wilson and his work with Porcupine Three, Opeth, Katatonia, Blackfield, Paathos... I can only foresee benefit to OL if they work together.

I don't think Steve has changed dramatically the sound of Opeth, they just helped opeth lifting onto a different stage of composition and he did it very well not only because he's a great composer and producer but also because mikael's got an enormous talent
 
I think it would be very interesting to hear what it would sound like if Orphaned Land and Steven Wilson worked together. I dont think it would change the sound of OL but it'd be interesting to see if the vocal harmonies and stuff made their way onto the OL album or like melotron and voice effects and things like that. Whatever would happen, I'm sure it would be awesome because, well it's Orphaned Land for one thing, and because Steven Wilson is a great producer.