Y axis gantry weight reduction

I am assembling my second MK1 and planning to mount it vertically ( apparently at a 15 degree angle has worked well for some).

Has anyone drilled / cut holes in the aluminum angle used as a back brace in the Y axis gantry to reduce weight?

I am concerned about the weight side-loading on the delrin v wheels.

I have been running mine vertical for some time now because of space limitations. Have needed to tighten the anti backlash screws a few times to prevent it from creeping when idle so I am considering a counterweight and pulley to lighten the load. It would be nice to know the basic weight of the gantry for that purpose.