D-I-Y Home Networking

I decide to buy a router. Wireless ADSL router. I bought Linksys WRT54GL, with 4-port RJ45 and WLAN. This router has basic web filtering and basic firewall. It's allow me to block access up to 4 site.
Now, I have wi-fi at my home, which I can offer to my neighbour. On second thought, I should use to my home only.

All this devices, modem and router, I placed it and mount at one place, specifically up stair.

Now, I need to run UTP Cat-5e from there to living room. At least 1 port. This is for backup purpose in case I have problem with WLAN.