DIY SnapServer

I've been toying with the idea of making something like a SnapServer out of one of my older system parts in a small mini tower or pizza box. Once the system is built, is there a way to admin the system over the net, say thru a browser so you can remove the mouse, keyboard and monitor?

Not too sure if this will even boot as most system POST complain if the keyboard or mouse is missing. Is there a way to circumvent the POST checks?

-d