Drilled a couple of extra pass through holes in the F-704 & F-705 bulkheads. This will give me the option to run wires and coax for more magic boxes aft, either under the baggage floor or in the tailcone. I don't know exactly what my avionics layout is going to be yet, but Van's gives good engineering guidance for this, so I elected to go ahead and add them now before everything goes together. Vans actually allows up to a 1" hole if you stay in the center of the web, but that seems like overkill and since I don't have any of the systems in (or even anything put together!) it seemed like that area would be more prone to eventual interference with aileron push tubes or fuel lines or whatever, so I elected to do smaller holes more in line with the other ones called out.

After that, I dimpled everything, primed the flanges of the baggage ribs etc. I don't understand why some of the stamped parts are so wrecked and others are vinyl wrapped and pristine. The F-623's aren't in vinyl and they had oxidation all over them, just like the F-715 & F-716 floor ribs. Pretty sure they aren't alclad or they wouldn't look like that? Scrubbed them up and primed them. By comparison, the baggage ribs are vinyl wrapped and pristine, so for those I just primed the flanges that will mate up with the belly skin or internal structure.

I've got a pneumatic squeezer, but rather than get it out and setup, I just dimpled with my hand squeezer. No problem at all dimpling the .040 flanges on the F-704s. I just used the DRDT2 for all the ribs,

I also laid out the reference dimension for the crotch strap brackets. They dimension from a nut plate on the top flange, but in case anyone needs to know, the dimension ends up being 1 5/32 fwd of the stamped rib stiffener trough.

I ordered Crow seat belts a few days ago and have the email that they shipped 2 days ago, so I'm not going to install the brackets until they show up in case the spacing needs to be different from what's called out for the factory belts.