No not trikes.....
I am the one who does the yfz clips or should say we , me and fasttrackfab. No blending of two factory frames. We rengineered the front half of the frame and bent all new tubes and use the yfz mount points for easy parts.

If your gonna go through the time and effort to build go with something newer and easier to get. The 450 or 400ex is good but the 250 r stuff is getting harder to find in good shape.

The new frame I'm working on is for my girlfriend 250 4 stroke easy start button smaller 3/4 size frame to fit her and light So she can throw it around instead of looking like a rag doll on the yfz will basic all be a super mini class machine.  When that's done I'll start my next weapon x.