the 300 suffers from the same problems the 902 did
the precut holes are just not ideal for anything besides a mATX MB tbh.
You also have clearance issues with some Video Cards as well.
and lastly the airflow on that case isn't great either, especially if you put in filters.
And if you don't use filters, you'll need to basically clear the dust out of those things once ever 2 months or so.