Yes, you are correct but when compared to using wood, the quality of the final product depends on the skill of the person making it and the tools that are available to him/her. With these aluminium profiles I can get them cut to size, which means that I only have to drill some holes for the adjustable fittings and screw the whole thing together. I'm not as practically skilled as some people who build sim pits and I don't want to waste material so this seems like a decent solution my problem.