Lots of little detail stuff. You have to number the seat ribs 1-8 with 1,8, 4 & 5 being the most important. Deburred all those after filing the spot where you have to cut a vertical piece over a lightening hole (presumably, used in the manufacturing process).
Then prepped up a series of smaller pieces, the numbers of which all jumble together and mean nothing, but, trust me, I did it, deburred it, and riveted it all in place.
Was getting too tired to start on adding nutplates; will do that tomorrow.
By the way, on the part you see in the middle picture, Van's calls out AN426-4 rivet in three places. Too short. I used AN426-4.5 which were perfect.Lots of little things getting each rib prepped. Added Nutplates to sloped sections on some ribs including one which also calls for an AN52510R10 screw and an MS21042-3 but it is REALLY tough to get the nut on. I'm suspecting that there was another mistake in the Van's shipment (other bags were wrong) that hasn't been caught yet and that the MS21042-3 aren't really that.
In one other section, you cut out the cutout of the doubler plate on the web of the rib (I forget which one). The drawing shows on large hole but the instruction to cut out the cuttout leaves a thin strip on the web. As there is a #12 hole nearby, I opted to leave the strip and take the instructions literally.