Thanks for all the replies.
Donna, using stainless steel bolts and acorn nuts was one that I was considering. I was thinking of using a stainless lock washer instead of plastic, but will look into both.
Peter, thanks for the curtain details. I do have cabinets above the windows and I was looking a the IKEA curtain rods. Peter, do you have the bottom of your curtains attached to a rod? If not, do they hang out much?
Larry, thanks for the detail on trillium
attachment. Did you re-use the plywood backers that were there?
Perry, the reason I'm changing over to something else is the rivets had failed in most areas to keep the water out. After removing the liner, I could see dark stained areas coming from most of them. In the process of restoring the trailer, I've done plywood tabbing to hang all the new cabinets, just to get ride of holes, and would like the remaining holes to have a fastener that could be tightened up in the future, or more easily removed if leaks
do occur. I will still use rivets, but they are in areas that I do not have easy access to both sides of the wall. As a businessperson, I think the reason that rivets are used is to save time; money and they work reasonably well, which makes business sense. However, since I’m not as concerned with the time aspect, and the money is not that much compared to the rest of the restoring cost, I prefer to go with something else.