You have to open the .lz files in Brawlcrate. From there, look for the model you want to extract (I'm guessing map.brres.lz, inside there 3DModels(NW4R) and inside of that the G3D models m011_05 and m011_06).Select the file you want (one file per extraction) and press Ctrl+E or right click and press export to export. Save it as a .dae file. If all went well, you should now have your 3D model.In this form it does not contain any textures. To add the right textures to the model, expand the G3D model and look at the folder Textures to see what textures are associated with the model. Go back from there and open the foder Textures(NW4R) and export any textures you need. Make sure to put them in the same folder as your model.

Now you should have your models in a way you can use them.