I think the issue is more that the model is hilariously bad. You should, as a first measure, delete all LODs except for LOD0; this will make the model file much smaller.
Second, WCS' builds are hundreds upon hundreds of revisions behind FSO. We've sped up the generation of cache files by an immeasurable amount (To the point where we no longer bother writing out the cache files to disk because loading them takes longer than generating them). The "crash" you're seeing is just WCS taking ages to generate the cache (a process which will be sped up by removing the superfluous LODs).