No, solid acrylic.

I've not done it to a PC yet, but bending the tubes is relatively easy with a bit of practice. Just keep rolling the tube above the flame till it starts to feel like it wants to bend, then using a form or mandril. Basically something with the shape of the curve want, bend the tube over it. If you're good you can pre cut the tube to the finished length, put the bend in and fit it. Not as easy as it sounds lol when fitting gas and water pipe. At first I would bend the tube to shape then cut it down to size, more costly. But maybe not, as I would have probably wasted more trying to get it right first time. Plus monsoon have just released the pro bender kit to make things a bit easier, or you can get similar kits from places like machine mart.

I'm still pretty new to modding, but years of maintenance work has taught me enough to have a go at most mods. Once I get my case the way I want it, I'll finish it with acrylic tubing.