Could you also use VersaBlock with a cam instead? We're also fairly new to chain and lack a mill, but were planning on using the cams instead of a chain tensioner. Is one better than the other?
http://www.vexrobotics.com/bearingblocks-g.html
(And as a secondary request, if anyone has a picture with a VersaBlock and WCP Cam installed, that'd be much appreciated. It's hard to tell how the CAM mates with the VersaBlock online.)