I wanted to make and install the prison tower in my premium so I ordered this:
ebay.com link: ebay.com
Well, it turns out that it's way too big, no way it would fit. Not sure what others are using, but it isn't that one.
Rather than return it, decided to order the fence and turn both of them into a topper.
ebay.com link: ebay.com
I didn't buy those specific ones and got both for about $50 shipped.
Below are pics of the results along with a video that shows the tower flashers in action.
I put a red and white flasher in the tower and tied them to the red and white flashers inside the barn. The lights on the fence, street light and inside the lower guard house just behind the left fence are just tied into a GI. I thought it came out pretty good for $50 and a few hours of work (my kids built the tower and fence since it's made out of legos). If I was better at using EL wire, I would have used it for barbed wire all along the fence, but the wires are too small for my eyes and hands to deal with. If someone has an EL wire mod that mimics barbed wire and will fit this use, I'll take it.
If anyone wants help making this, let me know, happy to provide more detail. It did require soldering to the flasher in the barn and soldering in spotlights and other connections, but was pretty easy overall.
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