Those that are saying we should play Butler at RT and put Walker on the bench, I really can't see that happening. Walker has been a solid player at tackle and Butler really excelled at guard last year, to the extent that we were actually able to run the ball when we had him healthy late in the season.
The consensus is correct, I think; if this does happen, Walker returns to RT, Butler returns to Guard, and Levitre sits until he's ready to replace Hangy (moving Wood to Center).
Long-term (opening day 2010, perhaps), we line up LT Bell, LG Levitre, C Wood, RG Butler, RT Walker, as others have said. This line is actually starting to look halfway decent.