Don't know what kind of smoker you want to build but this would kill two birds with one stone, giving you an access door and adjustable vents at the same time.
The vent you show will work, you would just need to drill several bolt holes to mount it.
Lg Spicewine on trailer
Weber charcoal grill
2 ugly drums, semi retired
Bbq toolbox, formerly Chargrill smoker
My wife has gas, its a Brinkman.