Beautiful rig! I'm now wondering if I can fab myself a 2nd battery mount in the stock battery location of mine (not a GX)
One comment, however, you antenna location will have severely diminished performance. I'd recommend fabbing a mount to raise it above the spare tire. Performance will be greatly increased, I experienced this on a Prado and raising the antenna above the spare tire worked wonders.
Absolutely agree that the antenna could be mounted in a higher location and would yeld better performance.
The reason it's there are several fold, first: the mount was already provided by MetalTech on the rear bumper; second: I like the height so I don't have to worry about parking garages, car washes, and any other low hanging branches, etc.; third: It is primarily used for when we're off roading with the club since nobody uses CB any longer in the 4x4 community. Even with it in its current location, I can still hit all the local repeaters where I live. Not sure how large the HAM community is Caracas, but there are quite a few here in California with a lot of mountains loaded up with repeaters.
So, if I may ask, what are you building? A 4R?
Also, regarding the battery setup, I did a much simpler setup when I had my 100 series Landcruiser. If you go to this link:
Dual Batteries
and scroll down to #13 post, you'll see a post about how I set up my batteries. Because the Odyssey's are so short I need to use a 2x12 piece of wood (cut to whatever the length of the two batteries together are) to raise them up to about factory level. I then used what some people call "plumbers tape", basically metal strap with holes in it. I then strapped that under the factory mounted battery tray and around the batteries and used a turn-buckle to hold them all in. Nothing ever budged and it worked great! I know it's a little hill-billy, but since I don't have a box and pan brake to fab myself a nice battery tray, I had to get creative. The nice thing about the 2x12 piece of wood is that it's chemical resistant, does not conduct electricity, readily available and cheap!