Hi, Barry!
Fear not, mate, you can still do it...I did the same thing with Krakow's stacks...got ahead of my self and put them in place before giving the stays a proper think through. Here's what I ended up doing....
You CAREFULLY pierce holes into the top of the stacks where the stay wires are to be fixed, using a very sharp needle or pin. If you apply too much force and deform the stack holes a bit, fear not, paper is flexible and can be prodded gently back into the proper shape when done. I trust you have not yet added the stack screens on top? Good, then you are aces! Take the thread you are going to use and soak the end with CA glue and let it dry to stiffen the end real good. When dry it will be very stiff and make a wonderful needle to help thread the string through those holes...which you do, but first put a knot in the string so that when you pull it through it will stop at the hole. You are threading from the inside of the stack, through the hole and out of the stack. As you pull the knot towards the hole from the inside, put a dab of white glue on the knot, then gently pull the string until the knot stops at the hole from inside the stack. Let it dry well, and that end of the wire is done!
For the belaying point on the deck, locate where that is and, again using the very sharp pin or needle, poke a hole into the deck. Now this is the tricky part...you will thread the wire/thread into that hole until you get most of the slack out of the thread. It will not be tight enough now, but we will take care of that soon enough. Once the thread is in the hole and most of the slack is out, put a dab of white glue on the hole and thread. Let it dry just a bit until it starts to set, then, using another needle, glently and steadily push the thread into the glued hole more, a little at a time until you think you have all of the slack out...leave the needle in the hole with the thread to hold it in place and let the glue dry even more, but not totally set. White glue is great for this because it gradually sets and starts to hold the thread in the hole better and better. If the thread loosens up while you are doing this, as it might, simply put another little dab of glue and continue to work the thread back into the hole and, again, hold it in place with the needle. When you feel the glue is almost totally set, usually a few minutes, twist the needle gently to release it from the glue and gently remove the needle...the thread should stay put and be nicely taut in the hole. Put another dab of glue in the hole left by the needle and let it all dry thoroughly. And that should be it! If you time it right, you can have one thread setting with the needle while you install the other thread on the opposite site of the stack, so that it evens out the tension on the stack and doesn't pull out the thread with the needle in it. Well, at least that's the idea. :lol: But I have the fullest confidence you can do it.
I hope this helps give you some ideas on how to rig the the stacking stays. I would suggest using CA to set the thread in the deck hole, but I know how you are with CA and I don't want to see the next posted photo showing your finger stuck to the deck and thread. :lol:
Cheers!
Jim