I believe that I've finally almost wrapped this up. Fuel pump is permanently bolted to the pallet with An4 bolts up from the underneath side with blue locktite on the threads. Locally grounded from the negative terminal via a wire and a ring terminal to a nut plate in one of the side angles. Vans print calls for the line from the pump to the firewall to be sandwiched in foam between the floor and the tunnel cover. This has always seemed kind of shade tree to me. Plus, since I'm going with a taller tunnel cover, that doesn't seem practical, i.e. that would be a really tall stack of foam. With that in mind, I decided on a different solution. I added a crossbar fwd on the pallet to support an adel clamp on the output line mid-span between the pump and the firewall. Probably overkill because it certainly wasn't going to rub on anything but now I've ensured that it's captured rigidly and the the firewall elbow isn't able to rotate if the jamb nut loosens up on down the road. The whole plumbing run is now very securely captured and can't rotate, chafe, or otherwise misbehave. Fabricated the output line, installed stainless steel AN fitting at firewall. Output line from pump to firewall is just finger tight at this point. There is clearance between the wire bundles and both the floor and the lower face of the boost pump mount pallet, but I've ordered some snake skin from spruce and when it arrives I'll pull the pallet up and add it as additional chafe protection. I'm also going to add a piece of corrugated conduit under there so I can route the wire from the OAT probe after the wings are on without pulling the assembly out again. I believe that OAT probe will be the last wire to run aft thru the tunnel. After snake skin and conduit, I'll permanently install the pallet and all plumbing. Feels good to get this wrapped up. I was really getting sick of plumbing. Unless something leaks, the only plumbing left is in teh wing root, and that can't happen until the wings go on.