The alternator cover is pretty simple, it has three or four little grip spots. It has a huge magnet inside that will give you a little grief but it's not bad (DO NOT PRY IT). Just make sure to keep track of all of your cover bolts by length/location and be sure to remember where your copper washer is.
I would only ever powder coat my covers if I personally did the masking. You don't want any down the bolt holes or over the space for your copper washer and damn sure not any on the inside of the cover. Powder-coaters do that shit all day every day which makes them lazy and complacent. You should also powder coat your wheels.