Ok, so another update. I decided to return the Woodpecker and go with the LR32 in some capacity. The Woodpecker, using the supplied pins, had a bit of play in it that I thought would result in compounding error when not registered securely against a side. More of a feature deficit than a design deficit. So, it is getting returned tomorrow, and the proceeds put to a LR32 rail.
So the question becomes one of the $250 set or the $495 set. Obviously, you get more out of the systainer set dollar for dollar. But I could be within two dollars buying it piecemeal, since I don't care about the clamps (and since my efforts to sell things have not met with good results). I know I need the plate, rail and centering bit to start. How crucial are the end stops, since they don't come with the 250 set? That adds $58 immediately, unless I can make my own?
That said, I am leaning toward the full systainer set for ease. I should be able to return the bit I bought, or exchange it for the one in the set.