So my daughter saw the top of the bunk bed where her daughter/my granddaughter would sleep and said, "No way. Ava will roll right out of there." So I went looking for modifications on bunk beds and did a slightly different one than Greg A had posted (https://www.scampowners.com/forums/top-bunk) not too long ago.

I used 1 inch PVC -- two 8 inch pieces, one longer piece -- about 37/38 inches, and two slip on 90 degree elbows. Created in just a few minutes since I had the hardware store cut it for me. 

Now daughter is thrilled with granddaughter's safety. And of course, granddaughter Ava has been thrilled the whole time because she gets to sleep, "Up there!"