The K3 arrived whilst I was preparing for IOTA. I managed to build it to the 10w stage in 12 hours. The 100w stage took an additional 2 hours. The build was straight forward and well documented.
As can be seen from the above picture, there are lots of bits to assemble and close attention has to paid to the types of screws and washers used for each part of the assembly. Other than that, if you have put a computer together in the past then this will present no problems.
Before long you start to see the radio taking shape and the exitement starts building. I had planned to do 6 hours and then have a break, but like a good book, I just couldn't put it down.
The K3 is an excellent transceiver and to date I've yet to find something that doesn't work :-).