I have built many scale models using the Century fuselages, from their small ones that use mechanics with 550mm blades to gassers that use 720mm blades, and also some of their 30 and 50 nitro scale models that come with their mechanics. All have proven to be top quality.
Recently a club mate built that AS350 using the Century 50 scale mechanics that he converted to electric. It is a real gem of a heli.
There are a number of people in the scale heli forum on HF that have used the T600E mechanics with multi blade heads in various Century scale fuselages and have been very happy. Check out that forum for more info:
http://www.helifreak.com/forumdisplay.php?f=27