Pattern is a Flying endeavor. It doesn't require that anyone have magical mechanical capability or ability to build their own stuff. In fact the rules allow assistance for any mechanical matters and serious teams (one pilot and one assistant, or, in the case of World teams, each pilot has his own assistant) often have an expert mechanic on hand. The rules also specifically prohibit flying assistance......

Electrics enable the assistant (mechanic) to become simply a caller. If the assistant can also serve as a maintainer of all equipment and systems, all the better. One would be hard pressed to find any team however that doesn't have as serious an assistant as the pilot in all matters of maintaining the pilot's ability to compete with minimal effort.