I found a way to extract arena models with noesis. Textures need to extract first to .dds to same folder where .rx2 file is and then load model in noesis.
To extract textures # needs to remove from #noesis.setHandlerLoadRGBA(handle, noepyLoadRGBA)
and put # in front of noesis.setHandlerLoadModel(handle, noepyLoadModel).
Like this:
You can download Madison Square Garden model with extracted textures and noesis script here:
https://app.box.com/s/vhgj6j3ospvj2dt27iubewaf1qmai729
If you have other rx2 scripts in plugins/python folder move it out when use this. Use this script only arena files. If you want mod textures with rx2 patcher use the script I uploaded before.
Screenshot from Noesis and MSG model. There is no seats in model because it will be added separately in game from .cwd file. Some textures for example jumbotron digits looks weird because I don't know how 2d sampler map1 and map2 mapping works.
