looks like something that is not going to be used in the basement where noone will bother if it is safe or not.
everyone has listed theory books, but is it not so that if you intend to use something, either commercially or around people that are not only yourself in miniscale at home - there are typically regulations around that and those regulations/guidelines basically tell you what to study and how to secure a sound structure for the intended use. Often these are giving you the way to calculate, and also have evaluation criteras to be fulfilled, sometimes also on how "stressed" a material is allowed to be, etc.
just saying....