Are those Poser primitive boxes scaled to different sizes? If that is the case, you'll have to have separate instances and modify the scale in the material room for each one. I think it would be much easier to model the room in a modelling app and UVmap the whole thing. As Rorrkonn said, any modeller will do. You can either use UVmapper - a stand-alone UVmapping application that is not a modeller and has a free version, or use the UVmapping capabilities in your modeller. Blender, Hexagon, etc.

Poser 11 Pro, Windows 10

Auxiliary Apps: Blender 2.79, Vue Complete 2016, Genetica 4 Pro, Gliftex 11 Pro, CorelDraw Suite X6, Comic Life 2, Project Dogwaffle Howler 8, Stitch Witch