Tophe, you called?
OUTSTANDING! What a magnificent idea, and at last there'd be no torque reaction on take-off, a big problem with all Griffon engined Spitfires. With two engines the range would be a tad limited but wouldn't it GO!?

Funnily enough I just bought the Airfix PR19 yesterday and I'm looking at it with evil eyes already.
Equally co-incidentally I saw that contra-prop PR19, the one in the scource photo, the day before it's post-rebuild first flight some years ago at Chino in the US. I can't imagine why Supermarine didn't fit the 19 with contra-props in the first place, apart from the expense of course. Apparently the real contra-prop PR19 here is only that way because the guy who re-built it got hold of an ex-Shackelton Griffon and it already came with the gearbox!