I’m an electronics fabricator but am new to robotics and so don’t quite know what my options are. Were I to mount these brackets to an aluminum plate, I would have to drill the plate by hand. I read one user’s experience with mecanum wheels who reported that alignment was critical, and so am worried that even careful hand drilling isn’t accurate enough. Maybe there is a technique a more experienced builder can share? I’m also wondering if the 3 bracket mounting holes match an off-the-shelf structural part, e.g. something from Actobotics? Or if there is another sturdy motor mount that is available within some other structural parts standard? Thanks in advance for your experience!