Non-Controversial FanFic Question

[puddlemereunited at yahoo.co.uk]

I was just wondering if anyone else kept certain actors in mind while 
writing characters in Fanfiction?  
I believe I read somewhere that JKR had Robbie Coltrane in mind for 
Hagrid as she was writing him.
I know I have always associated certain characters with actors for no 
better reason than it helps me picture them in my mind.
So it was with great excitement that I read that Ewan McGregor might 
be up for the part of Lupin, as I have always pictured Remus as being 
a little McGregory.  In fact I have been working on a Lupin-centered 
Fic for awhile, and I have been using Ewan as a sort of literary 
dresser's dummy.  
Has anyone else suffered a similar malady?

Yours,