Nigel,
I don't think you can go wrong with anything Steve S has designed. Looks great !
He's an icon.
I built a little different version that had vectored rudder thrust. Could hand launch or r.o.g. from a grass field. Like all my other foamie profiles, I use a GH-V2 2212-06 yielding 24 oz of thrust at 19,000 RPM while drawing only 23 amps with a 6x4e MAS or APC