Arduino Mega, with Serial1, wireless and memory card, plus enclosure

So today I got the arduino mega hooked up, ran the wires to the spi inputs for the Mega (53,52,51,50), attached a shield so after I do my final tests I can solder the wires in permanently, hooked up the xbee and 18 led matrixes.  It's working great, on external power it boots up everytime and read the memory card data and the pushed to the displays. Also, yesterday all of the pieces for my housing came in.  TAP Plastics did a great job of cutting everything and keeping everything organized.  Now we'll just need to create a template for drilling the holes, and start assembly.  Is that a light at the end of the tunnel I see?

External Power

So I did some reading and some internet searching, and think I have at least part of the power issue figured out. I purchased a 7805 +5VDC Voltage Regulator, wired up my 1/2 size breadboard as my external power supply and added an led to that board and to 3 others down the line as a visual to see if power is being routed properly. Now with just the ground from the Arduino going into the circuit I can get everything operating properly. So the next test will be to get a Voltage Regulator with a higher current rating and a heat sink to get up to the current I need to drive all of the leds. 2 internet posts that helped a bunch. *ITP Physical Computing & *http://pixelriot.com/pmatp/node/285

Also http://www.tkk.fi/Misc/Electronics/circuits/psu_5v.html