Time to ventilate this thing.
Existing (and I assume original)
The "living hinge" at the front isn't going to be alive for long, I kinda worried about losing the lid on the highway.
Old glue was surprisingly supple yet.
Slight size difference.
I could have just got another 9" vent and popped it in. I am wanting to add a fan as an alternative to adding A/C to make it more usable in warmer weather. There is an 11" fan that was tempting because of the size but it had pretty mixed reviews on how well the fan worked and was a off brand.
So this will take it from 9" to a more standard 14" opening.
I can't go ahead any more without running into the light, so it will have to go back 5". Not knowing how far the plywood goes I will probably just take it 5" inboard too so I can at least have plywood on most of two sides to hold it on. If I get out of plywood I will have to add a wooden frame on the inside to screw to as well.