I converted my MIM 50's Classic into a Baritone with a conversion neck from Warmoth. I tune it A to A.
http://www.hackolutions.com/baritele.jpg
If you want to do an E to E thing, I suggest you call Tommy at USA Custom Guitars. They make a Baritone VI body and matching 30" scale neck to do E to E.
http://www.usacustomguitars.com