There's enough room, but...
I've got the kit (and it's a great looking kit, by the way-even include styrene resin!) and there's easily enough room in it for the Kyosho fan (I got it before the Toki came around), however the ducting won't work as is.
The diameters are just too diferent. I was going to split the duct and add to it with a small strip of fiberglass down it's length. The thrust tube is area ruled, by the way and may be useable. The intakes would require a cheater hole, probably.
My impressions are that the kit is easily srtong, roomy and light enough. Anyone know how the Toki's getting tweaked to get near 3# thrust? Pipe length, fuel etc.?