Great macro shots, will have to save for a macro lens. I have been using a set of tubes and the 75-300mm lens. Works ok.
Not yet up to your level but working on it.
http://www.flickr.com/photos/cboylen...7618593818232/
Hand held outside shots are very hit and miss. I'm lucky to get 2 or 3 I'm really happy with each session. The rail and mini studio looks like it will give very nice results.