For everyone who is interested in the actual progress of mambo-phpShop: There's a CVS repository available at mosforge.net. So you can grab your copy with any CVS program:
cvs -d:pserver:This email address is being protected from spambots. You need JavaScript enabled to view it.:/cvsroot/mambo-phpshop login

cvs -z3 -d:pserver:This email address is being protected from spambots. You need JavaScript enabled to view it.:/cvsroot/mambo-phpshop co mambo-phpShop

Please know that this version is NOT backward compatible and must be used with the actual CVS version of the upcoming Mambo 4.6 (information for Mambo CVS access: here). You can choose whether to install from directory or pack all files into a zip and upload using the Elements Installer.
Since this is a developer version you could be faced by some errors. If you do so, please report any issues here...