Tue, true. I even made some single 18650 battery holders so I could put those on each leg near the feet as well. This thing has been such a huge timesuck, I may have to pick up another project for a couple of weeks then come back with a fresh perspective. I have been frying electronics, faiing 3d prints, I burnt out my 80w laser, frustrations mounting.I understand what you are trying to do. The more weight you can get into the feet, the more stable it will be. IMHO
I am already about year into this off and on. Long sigh....