Am I missing something for this Heater Box?

So I’m in the final stages of assembly for my NY’er heater box! I know… I’ve lagged it for a long time but now I’m finally determined to get this Lowrider 68 going! I’m looking at being able to make the car move under its own power by summer at the very least.

I got sent back to night shift (midnight to 8) at work, so I have a bit more time during the day now to actually get stuff done!

Looking at my before and after pictures of this defroster vent linkage on the box, it appears I may be...

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