If that plane is designed around the hw609 edf unit I dought that a Toki will fit. After looking at the post with the demensions of the toki. It looks like the O.D. on the toki is 98mm. If you want to convert a current EDF to a toki then look for a jet that uses the Midifan or any other 90mm EDF unit. I am not sure about the size of the hw609 edf unit but I do know that it is significantly smaller. Looking at the kit picture there does not seem to be much meat around the bulkhead that fan mounts to.

The 90mm EDF units put out about 4lbs of thrust at about 1000 watts. To get up to 1000 watts you need about 24 battery cells. The cells weight is in the range of 1.3-1.7 oz each. So with the toki putting out close to 3lbs of thrust and saving the weight of the batteries the plane should have good performance.

Just my $.02

Ted