If you notice, the front of the boxes make awesome arm rests. I used outdoor carpeting instead of speak box carpet. It is sturdier, has a rubber backing, so deadens noise, its more comfortable as well. I hate carpeting, it takes forever, but I give myself a B+ on the carpeting job. Maybe an A-. I have had the same carpet on my back patio for 2 yrs, no fading, no ripping. Good stuff.
All together I have about 120 bucks, not including the 6x9s. I will finish up tomorrow. I am beat, 95 degrees, 110% humidity. I hate living in a swamp sometimes.