hey hazmat ,
got lots of friends in various industries , electr. / hvac etc.... get rid of the slinky style duct work on your filter etc... , you loose 40% of your airflow w/ it verses using hard galv. ductwork and avoid sharp bends if at all possible .
looks good so far , do everything in your power to learn from others mistakes on here , read up lots . you'll save tons of coin and time .
xcrispi