Needs help for building my PC case

Hi guys,

I'm building a PC of my own. It was a long-term dream of mine. As this is my first try, I thought it will be exciting to design and build the case too.

I searched a lot to grab more details on how to build a custom-designed case by ourselves. But I couldn't find any relevant information on the web.

I was re-thinking whether to buy a case or just to build one myself. Then I thought of just buying the internal of the case and then to do customisation on that. But anywhere in my search, I couldn't find any such places where this item is available in my area.

Then one of my friend who is also crazy PC building mentioned about a metal store in Toronto offering precision sheet metal. What's your opinion about approaching them? Please let me know your suggestions.

Thanks in advance.