Here's some photos I took today.
PHOTOS LINK
It didn't feel like I got a whole lot done. I wrecked the sander belt, and mis-measured some cuts, the band-saw is nearly toothless....
BUT! I did get the the bottom section of battery rack actually officially bolted to the frame! It's a little overkill, but gives me some additional attachment points for other components.
I ran a pair of angle irons parallel to the side pipes of the bike. They run UNDER the bottom battery rack (which they are welded to) and go towards the back of the bike where they bolt to the frame at points originally used to mount the stock transmission.
The angle irons are flush with the side pipes - if I needed to lay anything across there, it makes a good "shelf".
To connect the front of the battery rack to the cycle (right side of the photo) I cut a pair of flat stock irons about 5 inches long with a bevel to go from front attachment points to the front of the batt. rack.
Here's a view from the front.
So, that gets the whole bottom section of rack securely connected to the frame using four bolts. It's in there solid, but it's still removable for further, welding, grinding, and painting.
In this photo of the cycle...
The bottom section of rack is bolted in. The bottom two batteries are set in there. The bottom batteries' "Cap" is set on top of them. The upper batteries' bottom rack is set on top of that. And the upper batteries are set into it.
The middle section of rack will have a pair of short connectors on the front going pretty much straight down. Those will bolt into the upper holes in this photo.
On the back of the battery rack, a pair of long bolts or threaded rod will go through a couple little short pieces of pipe welded to the rack to hold the whole thing and compress all the parts together.
You haven't see the top-most piece yet. That's because I haven't built it yet.... The top only needs a simple tie down. I think I'm going to just use two angle-iron bars lengthwise across the batteries. That keeps the tie-downs AWAY from the battery terminals (both top AND side) and puts any bolts or threaded rod places where it's not going to rub on the riders legs.