Alex, yes I have built two 16" shiva sonotubes, I dont have any pics up of them because I dont have the computer gear needed. I put the shiva at the bottom and the port at the top, and had no probs fitting the driver on a 16" endcap. Theres a link at the top of the DIY page called "sonotube link page' or something similar, you should be able to find some pics of a 16" tube sub on there.