Thanks for the input. I have decided to use plastic tubing (3/8" OD) instead of the glue sticks so the 1/2" sleeves should be a good fit.

Good choice on using tubing. I used clear PVC tubing for years and it worked great.

I tried useing hot glue sticks to form fittings on a couple builds and wasn't impressed. They were generally very hard to remove, even wrapped in teflon tape (which was royal pain). The last straw was when I had a couple break at the bottom of the bend in a longer run. I tried digging the pieces out but ended up having to replace them.

I now use silicone surgical tubing over coaxial cable. The surgical tubing is very stretchy and hard to break. Both the tubing and cable are reusable. Because it is so stretchy you need to lube the cable so you can slide the tubing on (and off). I wax the cable first then coat it lightly with petroleum jelly (Vaseline). It's actually pretty fun pulling them out.

On my current build I made the tubes by preshaping "U"s out of polyethylene tubing. I inserted wire into the tubing, heated it lightly with a propane torch, and then formed them around a dowel. Once cool remove the wire and they hold their shape. They act at as forms and will remain in the finished tubing. The PE is very slick so bungee and cord slides through easily.