After modifying the ABP to use an aluminum build plate, I’m going to junk it and modify a Heated Build Platform to get much more precise control over the plate alignment.
As with the ABP, the HBP instructions tell you to use short-headed bolts to clear the guide rod. There’s no need to do that if you take the time to modify the plywood clamps, as described there, so they actually clamp across the entire width of the belt, thusly:
The result looks like this:
Plenty of clearance with better belt stability!