Build my own computer in a case that looks antique

I have been deeply influenced by steampunk lately and it has inspired me to want to build my own computer. I will either mod a case so that it looks antique or build it into an antique (or at least antique looking) writting desk. I also want to modify an old typewritter so that I can use it as a keyboard but for the meantime I will just use a modified keyboard with typewriter (looking) keys. I would also like a steampunk mouse but I am yet to come up with a suitable design so I may just paint one so it looks like tarnished brass.