While the gauge of the stock is the same, Joe's repros are just a hair longer than the originals, mostly because his loops are slightly larger. The real problem was that the repro lumber loads I had were cut from one-by lumber, yielding a profile only 3/4-inch high. This wasn't tall enough to make contact with the tie-downs. The result was that the pins were loose and just dropped off with any amount of handling. Easy enough to solve, I just laid a piece of matt-board under one and glued a couple of wood strips to the underside of the other. This pushed them up high enough that the tie-downs actually hold the wood in place while staying in their slots on the top of the stakes.
Perhaps an exercise in anal-retentiveness, the two cars are now complete:

American Flyer's numbering system is tough to sort out, but I believe the 9-1/2 inch flat is a 3206 or 3216. I think the small four-wheel is a 3006, although I've seen an eight-wheel flat car described as having that number as well. Lionel never used any sort of tie-down on their flats, while Ives used chains (really tough to find).
Looking forward to finishing the layout excavation. Most of this stuff has never had track time (here).

