Hmm.. first, don't use that USM script, it's outdated and quite limited relative to what you need - I linked to that tutorial in the other topic so you could read up on the general process on what you need to do when exporting. Just download the latest ASE export script from the tools page
for your version of Blender (I suggest the UT one at the top of the list for 2.49 as that exports correct smoothing).
Second. You won't be able to export that particular type of object as a brush because it's shape is far to complex... remember as is mentioned in the model2brush tutorial
that your meshes need to be simple shapes because brushed are *volumes* (solid blocks) and not hollow shells (like the default cube in Blender).
Thirdly, what you should be doing is here is loading the model into Radiant as a misc_model
(RMB > misc > misc_model); using a func_static
means placing a brush primitive in the editor (textured in trigger_) and using the correct key/value pairing
in the Entities inspector.
You really should read the exporting a model as a map tutorial
as that explains what you need to do and how you should be thinking when modelling a level that you want to export out as a *.map file.