Unless one does a lot of dyno runs, and has access to sophisticated engine manangement equipment, building a homemade CAI for a MAF is probably not a great idea.
This has been covered before in other posts, so a search is in order, but the short story is that the air flow past the MAF needs to be VERY consistent with the factory air-flow pattern to insure that the MAF is measuring the air flow accurately. That is mostly why CAI systems for the newer models with MAF are non-existent. I'm not saying that it is impossible, just that it is difficult, and so far, not much has been done in that area.
Making drastic changes in that air flow pattern across the MAF WILL result in some serious drivability issues, including a potential loss of control of the throttle position in a drive-by-wire system possibly resulting in a limp-home mode shut down of the PCM or a CEL code.
Oh, and all those funny factory convolutions and extra holes, piping, etc., are all designed to cancel out air waves that throw off MAF measurements (and in the case of the earlier MAP systems, to quiet the intake tract -- which most of us would like to reverse -- we like our trucks to sound like they actually have an engine under the hood).