Here is my innovative Del Monte Gantry Alignment system. The table was adjusted so the cans would rest in the T slots of the table rails:
The limit in forward "Y" movement (gantry toward user) seems to be the SHCS on the left side idler. Replacing that with a button head M5x12 would give a bit more travel. Could also notch the gantry end plate but that seems like overkill.
Here's my 3d-printed laser holder/pinhole mounted in the laser brackets. I only did very minor adjustments here (mostly on the gantry mirror) to get the laser to hit the final mirror. The red spot is visible on the bottom of the frame, but it is actually very far forward of the carriage.
One of the mirror holders has a poorly made thread on the mirror retaining ring and it can "cross thread" while being unscrewed and jam up. When you catch the threads right it's as smooth as the others but I ended up removing it from the "bridge" entirely to mess with it before I figured out what was going on.
This final shot shows how close my aiming laser is coming to the X idler. I guess it's missing it so that's good enough! I might have put that idler over too far attempting to get more travel on X without realizing where the beam would be: