For an "always on" install:
Well, I've done some deep diving into the old posts, and There's no doubt that the BT connection from the Aladdin XT needs to be grounded. Also, the L frame ( also known as the "D0" on the ver 1.6 xboxes ) needs to be grounded, and can be done so during the LPC rebuild.
Where you've confused me, is when you mentioned the L1 being twisted together with BT and then connecting these two to chasiss ground. I have not heard of tying L1 to anything, and that it should be left unconnected. Did you mean to say the L Frame ( D0 ), instead of L1?
Also, I've been looking at a way to clean up the extra wires that you've got running around in your install. Ground the L frame to the screw hole just above the d0 wire in the Smartxx diagram. And since we have the pin header on our chips from wup, we can install a small jumper wire as circled in black:

This would give us a clean install with an easy hot swapable capability.
If I'm missing something about the L1 connection, please correct me. I appriciate the help!