I find the amount of engineers who have built an “alternative to google on their spare time” truly fascinating. Because if you think that is possible, IMO, you have no idea what Google actually built.
Its just not a search engine, and also, as a search engine, it stopped being a good model to follow a decade ago.
Build on the ideas and build something new instead
Eh no not necessarily. This depends on the type of audit and the questions specifically, but should never be a default stance if you want to provide a full report. Moreover, if you are learning to do software audits, it would be beneficial to check everything because experience is key to know what you are looking for