Hi Gus,
Thanks for the comments, appreciate it. As joe90 said it's only to support a shelf, which will have some wood and other items on it. I'm also an engineer, although the aerospace kind by training (now I fly for a living) so completely get where you're coming from. This is only a DIY Pizza oven project. Anything more serious I would be getting a professional in!
Anyway...it turned out OK, apart from the rendering which is awful!
Cheers,
Ed