Well, design is a noun, so it is okay. Its verb form is the same as its noun form, so that makes it different from manufacture and manufacturing.
In the same way manufacture is as much a verb as it is a noun:
Manufacture 1. noun, The process of manufacturing goods
2. verb, Process or make goods at a large scale using machinery.
(Source Collins English Dictionary and Thesaurus Express Edn.)
So I think it is exactly the same. :) If the gerund was required, CAD would be Computer Aided Designing??? :)
About 'discovery of the'... yeah, I think discovery is a bad word! I think it is almost a cliche even though it is only one word. But I think you should find an alternative to 'attachment'... what do you mean by attachment?
Attachment is a term used to mean a junior position at a firm, think internship, work experience. I think it originates from attaché (The junior member in an ambassadors suite). Would you think internship was more appropriate? Because I really wasn't enrolled as a student, but I was getting instruction in the workshops and laboratories. So summer school doesn't quite explain it.
This is what I have now:
The thrill of having finished my Ordinary Level examinations was quite evident in the first few weeks of the summer of 2009. This time was dedicated to a lot of rest and relaxation through one of my primary pastimes: reading. I read a lot of books, both fictional and non fictional, in the first month. I remember reading Wine for Dummies and being fascinated by the culture behind the wine-making process. It is quite remarkable how the practice is a delicate balance between science and art. In fact, reading the book has given me a resolve to find a way to scientifically control most of the variables of wine making to increase the process' efficiency whilst not compromising the product's quality. I hope that with a degree in chemical engineering, I will one day be able to achieve this. In addition to that, I also read The Six Suspects by Vikas Swarup, a book that soon claimed first position in my recommended list. The author's ability to develop six distinct plots and ultimately intertwine them into a single story was especially captivating. Later, I enrolled in driving school and successfully earned my license. Finally being able to drive my mother to various destinations was a high point of the summer.
The major event during the summer of 2010 was my internship at the University of Nairobi's School of Engineering. I was lucky enough to have an introductory course at the mechanical, electrical and manufacturing engineering workshops. Here, I gained invaluable insight into the practical component of the mechanical and electrical engineering course. I particularly enjoyed the fabrication laboratory where I learned the basics of computer aided manufacture using computer numeric control machines. The wall hanging I designed and ultimately crafted still hangs in my bedroom as testament to the incredibly enjoyable and educative time I had there. Another experience of great significance was voting in Kenya's referendum on a proposed new constitution. It being my first voting experience, I was quite excited to finally exercise my power to determine the direction the country took. Contributing to the realization of reforms is a great feeling and I am glad that I was involved in making history.
The past two summers were as interesting and beneficial to my development as a person as they were varied in types of involvements. Learning to achieve equilibrium, I tried my best to balance the activities I did purely for entertainment, those I did to develop certain skills and indeed those that served both purposes.