Air box behind aft hull vents 23

[Daysatsea]

I am in the process of finally putting my 23 back together and was wondering if any of you have thoughts on a better air box system behind the aft hull vents on the 23 I/O. Mine has three pieces of pvc pipe running up through the vent box with a small gap near the top to allow air passage. Any of you guys come up with a better way? Also looking for alternative vent covers that don't get trashed every time I swing into the dock