impressive bit of kit! I made a chainsaw milll a couple of years ago, and use it with my '66 Homelite C91.. not quite in the same league as that beast though.. having said that my brother bought the saw for £1 (not a typo), and the mill cost me a few bolts to make, so value for money wise, it's not bad..
I later put a handle on it to help, but it's pretty heavy to wield (especially when you're a 9stone weakling like me), though not so bad once cutting in the wood.