Hi folks!! Long-time lurker, first-time poster, and first-time amp builder here! I've been researching amp building for a while (probably a couple years on and off), and I've been gathering parts over the last few months (a surprisingly time-consuming but fun aspect of the amp building process!). Most of the parts I'm planning to use are from the Mojotone 5F2-A kit, but I've "upgraded" a few things here and there (more of which later in the thread...). From reading various threads here on TDPRI, I've learned that one of the best places to start an amp build is by drilling a few additional holes in the chassis. I know I definitely need to drill one hole for the OT (thanks to the legendary build thread by @theprofessor and many knowledgeable contributors!). Also, the chassis does not contain any board mounting holes, so I need to figure out where they should be located and drill those too. So my first batch of (probably many!) questions revolves around ground connection locations. I would be really grateful for responses on any of the following items: I'm planning to use the power supply, split grounding bus, and heater wiring approach suggested by @robrob on his superb site. I'll need a chassis hole for a dedicated safety ground. Is the location of the safety ground super critical, or can it be located anywhere near where the AC cord enters the chassis? I understand the ground wire should be cut longer than the hot and neutral wires – would there be any concern with looping the AC ground wire and placing the connection on the left side wall of the chassis, near the PT (see 2nd photo below)? I plan to mount a euro-style terminal block to connect the AC neutral wire and PT primary wire together. I'm assuming this block should be located somewhere near the PT, any specific location? I believe the chassis connection for the preamp ground bus is via the input jacks (and possibly the pots?) and therefore doesn't require any additional chassis drilling, but would really appreciate it if someone could confirm this. I believe the power amp ground chassis connection is typically the upper-right PT mounting bolt. Just wondered if there are any advantages to using a separate chassis hole for the power amp ground connection? And if so, would its location be super critical, or can it be anywhere in the vicinity of the PT? I know people have had issues in the past with drilling Mojotone chassis and affecting the finish. Has anyone had issues recently? For anyone who is not familiar or needs a refresher, here are photos of the Mojotone 5F2-A chassis. I've circled 3 holes in yellow that I don't believe are used by the 5F2-A kit (please correct me if I'm wrong! ...mounting holes for a 5F2 choke perhaps??). So I guess these 3 holes could be candidates for some of the above locations to save drilling time. Thank you so much for your time and for reading this far! I will keep you posted as the build progresses!