when you say rebuilt ? complete rebuild of the whole or just the motor ?
the G60's are quite easy to rebuild the basic engine is nothing spectial building it is pritty much the same as an 8v GTi motor but with a few diffrent parts. so plenty of places should be abel to do that for you. if ross or ledbury isn't to far chould build you an engine but removal / refiting would be a push as pritty much flat out