Young gun,
lookin good. I actually built almost a identical panel for my passenger kick panel for the same stuff to clean up the bay just like you.
A few things I was gonna do:
for the kill switch and battery cables I was gonna get a 2 post switch and run the Batt+ to one side, and then off the other to my "power post" just as a junction for the fuse panel and whatever... then continue the batt cable from the post to the starter so that I only have 1 cable into the engine bay, not the fuse and starter relay wires as well.
For the ALT + I was gonna run it back all the way to the Battery side of the kill switch, (pre switch) so that when the switch is flipped it does not let the ALT to continue to provide power to the engine/fusebox. (necessary for tech inspection)
The Batt - I was gonna run straight to the block, and then a jumper back to the frame and to a ground post. (I am running EFI, so I wanna make sore the block has a really clean ground)
** I am not a guru at this by any means, so chime in if there something I missed**
JOE