I'm even lazier. I used a cardboard box and a few pieces of 2x4's to prop it up, down and sideways. I didn't paint them either. LOL.
On a serious note, Jack, I read all your porting info and studied your picts several times. I used the different grits of emery rolls, they wear out quickly, so buy them by the bag full. I didn't go crazy, I just smoothed out the casting flaws and by your instructions, I worked on the short radius's and whittled down the valve guides. I matched up the left and right hand ports by sight and feel. I did this over a month's time, while re-reading and comparing your picts. To repeat myself, I didn't go crazy, at least I don't think I did.
My 72 xs650 is now a 750, Mikesxs kit, with a 1975 crank & cam and a Pamco. I did all the work except for the valve job. A local shop that does valve jobs and boring for my local bike shop. I was not looking for all out Kenny Roberts power, I want a bike to run well and last a long time. I've got ~8K miles on the rebuild now, and it runs great and seems to have a lot more torque. Oh, and no flat spots all the up to 6 or 7 grand in all gears.
Thanks, Jack!