Thought I should start small for my first one.
exp04_rgn_fens_of_nathsar+exp04_dun_charasis_epic01_queens.iop
Floor was a gray tile.
There was lots of "furniture" type stuff, vases and whatnot, so I did my best to stick to the outer wall of the zone.
I did the "start new map line" to fill in three altars and a couple of ledges, hope that worked ok.