Complex Model not Fully Loading

I've been working for a few days on a complex architectural model: https://www.tinkercad.com/things/iVuH6NqrHNB-pennsylvania-hall-gettysburg-college-1863-appearance-ho-scale/


All was great, until needing to reload the browser. Pulling the file back open to tinker, it seems to stall midway through load. Some voids become solids (particularly the windows). Other shapes have just dropped off the radar completely. And the loading circle beside the name just keeps on spinning - so I can't undo back to something that looks halfway decent. Did I get too complex in my build? Any way to recover? Of is the file dead and 3 days of work are down the drain?


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