well....painting is really no advantage at all...its easy to carpet a box..just need carpet...scissors and a tape measure...go to crutchfield.com...they sell all differetn colors of carpet...sorry if i wasnt that great of a help..just answering ur questions best i could....and my box ios homemade and i carpeted it..peace
I dont know how Formica would look but carpeting a box is very simple, it just takes time and careful planning. Make sure when carpeting that you have it planned out- because if you dont, the seams wont turn out to be close to invisible. The internet has plenty of info out there somewhere. But i dont think its that hard. Painting a box is not really the way to go. Painting is more for the kind of box that gets molded and is made with like cast fiberglass or plastic. If you paint your box when you get done you will wish you had carpeted it (unless your a very good sander). To glue to carpet use a spredable glue like Mastic (comes in a bucket). Make sure you get a spreader that has groves in it (like the kind they use for tile). Spread the mastic all over the box and work one side at a time (glueing than carpet and cut if needed). For a big box two people is nice to have. Remember box making and car sterio is an ART!