Yes Paul, Part 2 needs to be taken care of asap. I'll be building a 1/2" plywood box to secure both batteries and some extra storage space. This box with the batteries will be sandwiched between the rear seats and the future drawers/bed base that will be a summer project.
So once I'm done with the battery box they should become a sealed and safe unit. Should do it next week, dealing with kitchen passes now...
And for the firewall hole it's a good idea, I've done it for my snorkel and it worked really good. But I'm not too concern right now, there's 2 layers of split loom in there... should be fine until all the fun mods are done!
But not to be undone, here's one more mod that I just finished tonight; installing a TRABOLD remote (bypass) oil filter. It was a pretty easy install once I figured out where to mount it.
It's a German unit that's got pretty good reviews with Portal Expedition vehicles. I'd have to look at the specs again but I think it filters down to 0.1 micron and they suggest changing the filter cartridge every 24,000km, the OEM filters every couple years and the oil (synthetic) some crazy numbers (over 300,000km)! Regular oil analysis will tell me how far fetch or accurate those claims are... but it can't hurt to give it a try.
Here's a few pictures showing some of the prep work, install of the return line on the valve cover, the pick up line "T" at the oil pressure switch, the remote filter and the final result. Only thing I'd change if I'd do it again would be to move the return line on the valve cover further front and on the side instead of the top...
Nice thing with this unit is the filter element is accessed from the top and the option to have a oil sampler port (at the top) to make oil sample pick up made easy. With the fins on the unit it should also cool down the oil, maybe not where I mounted mine but move it by the grill and I'd see some benefits.

- Remote oil filter 1.jpg (108.59 KiB) Viewed 4587 times

- Remote oil filter 2.jpg (74.83 KiB) Viewed 4588 times

- Remote oil filter 3.jpg (82.03 KiB) Viewed 4585 times

- Remote oil filter 4.jpg (68.65 KiB) Viewed 4586 times

- Remote oil filter 5.jpg (120.96 KiB) Viewed 4586 times

- Remote oil filter 6.jpg (62.72 KiB) Viewed 4586 times
http://www.trabold.net/English/default.htm
Cheers,
David