Great idea to use velcro on the baseboard! I'll have to try that.
I also recommend the fabric store, look for Home Decor fabric on the cardboard tubes, they're about 10 inches wider.
I used this backdrop stand when I first started, and now when I go shoot in a client's home http://www.amazon.com/Interfit-COR75...8148948&sr=8-2
I get my seamless through Amazon, but as PP said, most are sold through Adorama.
I've also ordered from http://www.bhphotovideo.com