Yes, I agree, slickrock makes some nice sliders....and they wont do that twisting thing.
As far as RTE sliders being $$$....they are priced at $490......extra stuff will cost you more; $490 includes the nerf in either square or tube style.
About the SG bashing, it wasnt you that was bashing, it was me
I have thought about the sliders being used to hold oil or water or air, but I have decided that its not worth risking anything by using a piece of armor....designed to be bashed, as something to hold anything volatile or under pressure. There are safer and easily ways to do that.