We are using the openSUSE build service to build binaries (x86 and x86_64) for our installers.
You can operate it via webinterface:
or comand line interface:
http://en.opensuse.org/Build_Service/CLI
Get the osc client from here:
https://forgesvn1.novell.com/svn/opensuse/trunk/buildservice/src/clientlib/python/osc/
%install export NO_BRP_STRIP_DEBUG="true"