Hi I built my own buggy, it,s libreish with added bits and pieces. It,s got a 1.8m axle, higher side rails and a brace behind the seat. It,s made of mild steel as I intend to modiry bits and pieces as I go then will build in stainless when I'm happy. The wheels are barrow but about to get 16x6.5 front and 18x8.5 rear tyres, and the seat is a pl comp xr. I reckon the whole thing cost about £150. Though I have been welding for years and have a brother in law who is a machinist so can get bits turned for me. The headstock was the one point I thought about the most, I had a tube with a bigger dia at the top made up to accept a 12mm bearing and the bottom of the tube has a taper roller to take the load, the whole thing was then fitted through the down tube about an inch from the front end and welded all round top and bottom. To me this seemed the strongest way to do the job. If anyone is interested I'll try to get a couple of photos of it.