No problems...glad my experimenting can be of value to the community.
The only problems I've run into so far....
1) For inserting the middle reed switch (for the lower sash), you have to drill through some plastic then through the frame. That plastic is pretty thin and somewhat rigid...and the issue there is that it doesn't hold onto the reed switch very well. The reed switches I have are very slightly flared at the top and have little ridges, so that they get "stuck" when you insert them into the hole you've drilled. That works GREAT for wood...but for this rigid moveable plastic, it doesn't work so well. I've had one switch work itself loose, and then it got clobbered by the window as it moved past, so I had to remove it and replace it. I'm not sure just yet how to resolve this issue...I really really don't want to glue in the magnetic contacts, in case I should ever have to replace one. Bottom line, after you've put in the reed switches, make sure you keep an eye on them so they don't work themselves out of the holes.
2) I used gorilla glue to hold in the magnets in the bottom sash. That appears to have been working...but in one case, it actually split a small part off the sash because I used too much glue and it expanded. So just be careful how much glue you use. The magnets I got actually had holes in the middle of them, and it might have been better to affix them with a nail or screw instead of glue...but then you'd have to check carefully, as the magnet had to be completely flush with the side of the sash so it wouldn't scrape anything on its way up and down.
Your results may vary! good luck!
