Looking good. Thanks for sharing! I wish more WW users did this more often.
The only helpful critique I can offer is to spend a little more time hiding tiling in the textures. Here are a couple tips based on your examples:
cell_bed_01.mdl: Rotate one of the frame ends 180 degrees in Z so that the textures along the metal don't match exactly with the other end.
grave_02.mdl: There are noticeable tiles along the upper and lower rim around the outside.
warehouse_01.mdl: To hide some of the repetition, you can select each of the columns of brick individually and apply a UVW Xform modifier to that section and offset the U axis some on each.
Hopefully these little tips help you out in your adventures. Great job and keep sharing!