Hope this helps. I cut down a carbon Xlab Versa (cut the sides off), drilled a new hole in the mounting plate further forward and used that hole and the original "forward" hole to mount the Versa to the BTA mounts on the Alpha. Then I needed to find a way to secure the rear of the cage to the Versa so I made a very low profile nylon nut/screw work (cut it down a bit) The nylon screw is covered by black tape in the photos (the tape is just there to stop spilled sticky stuff from seeping down under the cage.) I will try to get another photo with the tape off. This rear screw is really just keeping the cage centered, it doesn't need to be something super strong. I also have double sided foam tape under the rear of the bottle cage. If you want more tilt in the Alpha you may need to add some small spaces under the screws that mount the Versa (and this actually makes solving securing the rear of the cage easier as you would have more room between the cage Versa and the Alpha. I had the spacers ready to go but I only have a few degrees of tilt so didn't use them. Sorry, not great photos. My Torpedo bottle is in the same location as it was on my Alpha, which is what I was going for.

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Team Zoot