I'm building a Mojotone Studio 1 amp which is my first instructionless build. I just finished building a Champ and a Princeton Reverb that went quite well. However, this amp is more like a Marshall type build as I gather, and there are some differences. I've got the amp built up to the stage of wiring (see below) My question/s are about the ground wiring. The diagram shows that there are 14-different ground points. The chassis is aluminum. Am I supposed to float the ground over the chassis and connect it all to the ground connector on the power cord receptacle? Or, do I use the chassis as a ground?