what do you mean do one at a time? my current setup is nothing i sold all my stuff because my amp blew. but my friend got a nice American Bass Hd15 so it made me want to get some beats back.
Ddub847 was right. Instead of looking at the big picture (subs, amps, deadener, wood, misc materials, wires, alt, etc etc) just look at one stage at a time. It's a lot easier and less stressful. First though plan out exactly what you want with your given budget, and then decide which you would like to work on first (electrical or equipment)if you want that much power I would do electrical because if you install all the equipment and still have stock electrical, your equipment will be asking for more power than your electrical and put out and you will get serious voltage drop which is bad for your amp