Before attempting any to produce any Engineering Design the following should be borne in mind. If anything can go wrong it will.
Nothing is ever as simple as it first seems.
Everything you decide to do always costs more money than you estimated. Everything takes longer than you expect. If you improve or tinker with something long enough, it will eventually break. If you try to please everybody, somebody is not going to like it. It is a fundamental law of nature that nothing ever quite works out.