Well yesterday actually. I posted this in my build thread, but I thought this might be useful for someone who was thinking of doing some inexpensive DIY:
So today was another beautiful day, I pulled that other rack of carbs out that I intended to swap one body out, but I kept thinking about that frame kit idea. I went looking for some metal bar that I could bore out to the same ID as the OD of the frame support rails. Nothing. Damn.
Then as I was wandering away in disgust, I almost tripped over an old CB750 fork tube. Rotten, rusted, completely worn out, but if nothing, I am a parts hoarder. I poked the internally threaded end over the cut off end of a support rail, and it almost went in! I lopped the threaded end off and was happy to see that the OD of the support rail was a nice snug fit inside.Woohoo!
Terry's Redneck Frame Kit by
terry prendergast, on Flickr
I had to chop up two old fork tubes to get four good 80mm lengths, but that's OK, they were free, my favourite price. I drilled 4 holes in each one.
Terry's Redneck Frame Kit 1 by
terry prendergast, on Flickr
Terry's Redneck Frame Kit 2 by
terry prendergast, on Flickr
I then chopped and drilled couple of lengths of stainless strap to use as the joiners for the triangle.
Terry's Redneck Frame Kit 4 by
terry prendergast, on Flickr
My favourite tool is my cordless Dewalt portable bandsaw, it's easy to use and will cut just about anything. Interestingly, when I made the first cut thru the left support tube, it "sprung" and the cut tubes immediately slammed shut behind it, and I had to unhook the blade and put another blade on the saw so I could make the rest of the cuts and then retrieve my saw blade.
Terry's Redneck Frame Kit 3 by
terry prendergast, on Flickr
Once cut, I loosely fitted all the components, then drilled the holes thru the frame for the slider tubes. (I made that name up, but it pretty much describes what they do, although I suppose "Support Rail Sleeves" would have worked just as well) It was easy enough to do with no engine to worry about, but will probably be a PITA with it in, thank God I only have to do it once. Anyway, once done, I bolted everything up, and I think it looks OK.
Terry's Redneck Frame Kit 5 by
terry prendergast, on Flickr
Terry's Redneck Frame Kit 7 by
terry prendergast, on Flickr
Terry's Redneck Frame Kit 8 by
terry prendergast, on Flickr
I'm thinking about cutting a slot into each one to allow them to pull down further against the support rails, but surprisingly, once moderately tightened there was absolutely no slop at all, so the jury is still out. All I need to do now is to gather up the courage to cut into my K2 frame..........
This job was made easy because I had the front section of a K0 frame that someone here kindly sent me a few years ago, thank you again, mystery parts sender!

Terry's Redneck Frame Kit 9 by
terry prendergast, on Flickr