I had a friend throw this together for me the other day, (i can read them but i have a hard time designing my own, not intuitive enough) and I thought it was pretty slick.
I ordered the parts (plus a few extras, minus hookup wire/general wire for the install, which i have/will get later) the other day from BG micro (including an 8Ah sealed lead acid battery) for about 60 shipped.
Comments? I cant put it together just yet because one of the most important parts is all kinds of backordered for a few days. Ah well.
Oh, just some quick notes: that 12v regulator mabobber in the bottom right is some random 12v regulator i got off ebay that has no real specs. go figure.