RE: what plane to build to go with a ips(the little one)
It's tough to build a 3D plane light enough to be able to use the IPS drive.
For the past couple of years I have flown a 3 Ch rud elev thro plane with the DXF drive with a 14 X 10 GWS prop with 8 110 mah nicads for power.
Plane is carbon rod and tube construction with food wrap for covering.
About all you could do with it is torque roll, loops, spins, etc..
I built a version with ailerons so I could do some real 3d flying, but with the added weight of the aileron servo and airframe structure, the IPS wasn't enough. I swapped to one of the IPS twin drives turning a 14 or 15 X 10 prop, and still don't have the performance I would like.
Bill