Photos Sub Frame Connectors

I have saved this on my favs. It is how to make your own subframe connectors. They don't weld to the floor, but they are cheap: http://www.bigblockdart.com/techpages/connectors.shtml

Here is a link to subframe connectors that weld to the floor, little more expensive though:
http://www.uscartool.com/Aframeconn/index.html

I guess it is all in personal preference.