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Ian, Campbell models are basically a box of sticks, most of which have to be cut by you to a proper length. They give you instructions (in most cases, haven’t built this particular one) that have a template for you to cut most of the pieces yourself. It would be relatively simple to modify the kit to suit your layout, in fact, very few of them are built just like the photo shows. It would be very easy to make it a bit shorter than shown, as long as you have enough clearance (at least the amount shown by the cleared-out portion in the pic. The area between that cleared-out area and the track is pretty much expendable.
I know this isn’t the exact answer you wanted, but I think you’ll enjoy building the kit.
Thanks kenw. I kind of figured that it would be relatively easy to "adjust" the kit, but I've never worked with the Campbell products before and want to get it as close to "right" as I can. The plan is to have this in the bottom left of the layout below, on the 18"R curve spanning the straight that runs under it. This will give me ~7 1/4 feet from the left side turn out and ~ 5 1/4 feet to the turnout on the right side of that loop (the space is 10' on the west side, and 9' on the north side, with the N-S leg being 5' wide, and the E-W leg being 4' wide). I think I just may exclude the top portion of the bridge above the arch, which will allow room for a train underneath, yet reduce the overall height. May not be true to life, but I pretty much live in a fantasy world anyways
