Hi Gary,
My first assessment would be whether it will be easier to remove and then replace the outer wall or the inner wall, and whether the property owner has a preference. Generally, I can do a removal like this without cutting anything. Unless it's glued to studs,
paneling comes off pretty easily and can usually be put right back up. Old barn wood like that can be brittle and the nails difficult to remove without damaging the wood, but it's not impossible. That said, if he's ok just cutting the outside boards to expose
the combs this should be a really easy removal, since you can see the combs just behind the boards. If you're cutting, make sure you don't cut any wires. 🙂
Look for the queen and cage her and put her in your box as soon as you find her. A challenge with a colony like this that isn't well contained is that sometimes she and a bunch of bees will find a place to crawl off and hide while you're doing the removal.
Don't smoke them any more than you need to. Work quickly at dismantling the combs and finding the queen to start out. If you can set up box to place the combs (intact) as you remove them, rather than trying to cut and rubber band them one by one, then you
can usually get into the brood combs fast and find the queen quickly before she has a chance to run off and hide somewhere.
Plan to leave the box at least an overnight for all the bees to collect in it. Get there early in the morning to close it up and transport it. Plan to move it at least 2 miles away, at least temporarily, to prevent foragers from returning to the site of the
cutout.
I usually have a bucket for combs of honey and nectar and just wire or rubber band comb with brood into frames. Feed them back what is in the bucket later or give the hive some frames of honey from another colony. A small table or a couple saw-horses and
piece of plywood is nice to have as a surface to work on.
Have fun,
Joe