Now new and improved with OGR-26 and RC5-72 analysis.
v0.6 - too many changes to list. I had loads of help from Darkness Productions and the RC5-72 code is based on Lani's, so thanks to you guys. I still require the stub-length or diff-length (or whatever) constraints for the stubspaces if anyone can help with that. Any problems let me know.
The formatting gets a bit broken when you post output here, but this is a rough idea of the new layout: