Mark Jaskolski has released 2 Wolfenstein to ROTT converter programs. They basically convert Wolfenstein levels and graphics up to data files which can be used to play those levels on Rise of the Triad. There's a comprehensive text file included in each of the zips.
Wolfenstein to ROTT level converter 4.01
Wolfenstein to ROTT graphics converter 1.00
There are screenshots at http://www.wolfenstein3d.co.uk/rteppics.htm