Thanks for the pics. I made a single bracket with two posts that bolts where the top post bracket goes, but i've moved the hydraulic brake light switch to behind the battery. Had it on an aircraft clip like the ones that hold the rectifier/regulator pod, but I think I'm gonna remake the cover bracket and mount the brake light switch to that, too.
Nice work on the battery tray. I have a Mk III battery tray that's been modded for a smaller battery, but I still think it's a bit bigger than what 750s came with. It also holds the bottom of the oil tank via a hole that a bolt slips through and threads into the bottom of the tank.