While we're on the subject, there is little room to change tank height in this model. If mounted on the engine bearers the tank feed line at rear of tank and presumably the rear "bubbler" end of the uniflow line will be about 1/8 above (vis a vis ground with model on wheels) the needle valve/fuel intake on the venturi. Is this a reasonable starting place for the PA40UL on uniflow?
Re what is "plus" about this Oriental, it is nothing like the classic straight-wing Oriental from long ago. It is a modern design built for piped 40 from the outset. As for what is "Oriental" about it, beats me. Dee Rice design, RSM kit. I enlarged the tail volume to be 22% of wing area.