Question Will this have adecent airflow?

Get a couple proper case fans. One for intake on the front and one for exhaust on the back. Another thing would be to check is the thermal paste on your CPU cooler given the age of your CPU if it hasnt been replaced in the last few years chances are its on the dry side.

Arctic makes there 120mm F12 and 140mm F14 which are usually under 10 USD.

Also clean up the power cables by using some zip ties to bundle them together and if possible attach them to side of the case out of the way of the air flow.