Hi,
I am using the e-smith server and gateway at home for quite a while without any problems. Installing wasn't difficult at all, using a so-called "dummy" domain. I only inserted a VGA-card and 2 networkcards, and within an hour all was set up. The built-in DHCP server provides IP-adresses for my network, and they had immediate internet connection as if it was a direct connection. No prob at all!
After that, I started to look at the documentury closer, and found out about the i-bays (usable as FTP-accounts), SSH (external access) and even internal email (which I don't use, but it works, hehe).
I have a dedicated connection (cable), and it's on 24/7 now.
Just to let you know it IS possible, and for me quite easy!
Greets,
Wietse