One 1-1/2" intake with draft pipe, ball valve up high and easy to reach. I can reach 350* easy, run it half open it'll cruise 275* for hours, and my fire burns evenly. No need for 3+ separate intakes IMO, not to mention capped ones mounted down low just mean bending over which is a pain in the ass especially if your smoker is in a tight area. Like others said keep it simple man.
UDS, Akorn, Weber Red Head Kettle, Drum Grill, Gasser w/cobwebs all over it. I'm JD.