Ok, for the battery set up (I still don't have pictures, it's dark again) but I bought an Isolator off of eBay, this one in particular:
http://cgi.ebay.com/ebaymotors/140-...itemZ370169557387QQptZOtherQ5fVehicleQ5fParts
Holy hell that's a long link. Anyways, the instructions are connect the positive terminal of your main battery to the Battery 1 terminal on the isolator, and the positive terminal of your second/auxillary battery to the Battery 2 on the isolator. Then it said connect the ALT port on the isolator to the "alternator output wire" of your rig. So starting at the alternator, I traced the wire to see where it went and it goes to the relay, which then goes to the main battery to charge it up. So I just connected the ALT port on the isolator to the place where the alternator makes contact at the relay.
So it SHOULD be all wired up. I put a multimeter on it, and tested both batteries while the truck wasn't running and they tested about the same, the main battery had a little bit more charge than the second battery as the second one has been sitting for a bit. Then I started the truck, let it sit idle for a few minutes, then took two more readings and both batteries have risen. Now this is assuming I had the multimeter on the right settings (I'm pretty sure I did) as it has been a while since I've used one haha. But they both did rise, so I think it's working. We'll find out when I get seven 150W lights hooked up to it.
I bought this isolator before I did a lot of research. If I didn't buy the isolator, I would just hook up two batteries in parallel, which a lot of people have done with great success. It just doubles your capacity while having the having the same output voltage. Anyways, this seems to be working, I'll keep y'all updated on it, and get pictures later if anyone needs any clarification.
As for the charging system, I didn't do anything special, it still has the stock alternator (95 Amps I think). When that craps out, I'm going to put a 130 Amp alternator in it, just to get a little more juice flowing.
And thanks for the compliments, I greatly appreciate it. It's far from done but I like where it's at for now. I'm going to be starting a front bumper soon, still not sure what to do...(any suggestions please feel free to let me know!)
As for getting some measurements..I'll have to get some tomorrow, it's too dark to do much. But I know the bed part is 30 inches wide, the fenders are 13 at the rear (by the taillights) and end up 15 wide when they reach the other end, so they're not perfectly square. The bed is also about 10 inches deep and 72 inches long. I can take some more measurements tomorrow for you.
EDIT: I just went out and retested the dual battery set up, and it is working. I was curious as to if where I connected the alternator to the isolator would be good enough, and apparently it is.
I also wanted to add, just in case others didn't know, what the isolator does. It allows you to use a second battery as an auxillary battery, for your lights, winch, etc. So the isolator will recharge the second battery as well as your main battery. The good thing about it is, just in case you run yours lights, winch, and other stuff while your truck is not running, it will only drain your auxillary battery and not the main battery, allowing you to still start your rig.