Box section sills

[Paul h]

Hopefully going to be getting grinder on the sills shortly I want box section on instead.so any ideas as to where to cut the sill off to and what diameter box would I need

 

[R1cho]

makeitfit made some rock slider sills and did a post with pics here http://www.nissan4x4ownersclub.com/forum/showthread.php?t=13272&page=2 should be a good starting point :thumbs