Generally, if you compare wing area and weight of a known setup to the plane you're trying to power, you can get a good idea of whether or not it will work. I believe Greg's Taube is much smaller and quite a bit lighter than that. Most important is that it's about 2lbs LIGHTER.

One of the schools of thought in electric is power loading, or Watts per pound of all-up weight. The Endoplasma system is only capable of 400 Watts, and that's an inefficient brushed motor 400 Watts...

This system won't increase the weight of the airplane over a .40 glow and full fuel load, so if you change nothing else, you'll come out at 7lbs. 400 Watts on 7lbs is 57 Watts per pound. With a brushless motor, you'd get scale flight, but on the Endoplasma, it's going to be anemic.

Is the plane you want to convert built yet? If you make every effort to save weight, and build a custom battery pack to mount forward of the firewall, you should be able to eliminate a few ounces of structure, and ALL the nose weight you needed to add with the glow engine. Get the plane down in the 6lb range, or less, and the Endoplasma just might be enough.

Replace the Endoplasma with an AXi 2820/10, same battery, same prop, and you'll be much better off. If you compare the cost of an AXi combo at Hobby Lobby to the cost of a quality 4-stroke glow engine, it's not that much different.