@Job, just read this thread and a few minutes to spare. I've setup laptops to be used as servers numerous times due to power issues. Basic guide is to use the "desktop edition" specs for laptops i.e  4 processor, 4GB RAM etc. Disable bluetooth, Wifi, and all other un-necessary stuff to reduce system resources. Default the VGA driver to a simple display settings. Ensure that the enviroment is not dusty and enable power settings to optimise power while close the screen. The laptop should be of business specs and high up on the performance scale. You may have a problem if the network card will not switch to 1GBit Ethernet, so check that out too and disable any power mode settings for the card. Its a balance between what a server should do but cant because of external limitations. HTHs.