Your solicitor needs to work harder for you. The contracts were signed on the basis of the plans furnished. You are clearly not happy. Your solicitor should be communicating your views to the builder's solicitor. It is not up to the solicitor to make decisions on what is minor: you instruct, he acts. Of course take his view into account but get other opinions too. Did you have the property professionally snagged, what does the snagger think ? These items do not sound minor to me.