The LK-72 is the kit version of the 299D, not the 299C. As such it would be most excellent with your Cornwalls as my son has the 299D and a pair of Cornscalas. Hard to beat with systems costing $30,000 and up.
Craftsmanship is extremely high with these speakers! I have 2 pair of Cornscala's and both systems use H.H. Scott amps (of about 30 watts per channel each) and to me it's a winning combination.
I am surprised, however, that McIntosh ever let that tranny pass inspection before sending it out for sale. Unless the tranny had a delayed problem in the windings?
Where that house is situated looks to be a perfect spot to set up a small observatory if there is good clear (no trees) to the south. I've been involved with astronomy for over 50 years and I'd love to be there! The things you can see with even a small telescope are amazing and it's all free, courtesy of our Universe. (I just hope there's no large city nearby - light pollution is a big problem).