Server rack/case recommendation

[manicottimuffin]

Hey guys,

 

I just built a home server and threw it into a mid tower desktop case I had lying around. I’m wanting to rack mount it, though, along with a network switch and potentially add up to two or three more over the next couple years. I’ll live in an apartment with my wife, so I’ll want it to be relatively mobile (aka not bolted to the floor or wall mounted and possibly wheels) and I’ll want it to be as cheap as possible.
 

Would I be better off building myself something out of some wood/steel/aluminum or buying a real server rack? I also am wanting to use my current ATX power supply, so potentially use a 4U case for this current build, but I’m not opposed to using smaller form factors in the future. 
 

What kind of trade-offs would I be making if I build my own rack instead of buying? And is there any noise/performance benefit to using a different size case?

 

Thanks!!