I've got a DIY bake-around cool tube. Here's a picture of it in it's current configuration:
I also just took some pictures of how I use iy in a DIY horizontal hood:
I use 4" PCV couplings to mount the Bake-Around. The BA doesn't quite fit in the 4" coupling, so I wrapped some foam weather stripping around the end and it fit's snuggly. You can see the black foam at the top of the first picture.
In this picture you can see how I mount the Mogul base to the coupling with a metal elbow:
The other end is connected to a 4" PCV elbow and then to a 80 cfm computer fan:
This all keeps the tube cool enough for me to easily grab and hold on to the tube. This is only a 250 watt light, though: