The only big problem is the diameter of the motor. I intended to put a Hyperion Z-5025, Castle HV-85 ESC and 10S batteries in a Prophecy. All fit well except the diameter on the motor. Flipping the plane over on a stand to change batteries is not a factor for me because I must work from a simple stand anyway. The pipe tunnel can be used as-is or replaced with a flat plate. If the firewall is in the way a 3 inch hole saw will remove most of it. Leave a generous amount of the firewall as a bulkhead.

A firewall/bulkhead may be easily installed closer to the nose to mount the motor. I believe (but have yet to try) the Hyperion Z-40XX motors will fit well and be more than adequate for the Sequel/Prophecy. My experience with the Z-5025/10S batteries in a Piedmont Sport lead me to believe that 8S batteries will be more than sufficient. The Sequel was powered by YS-120 engines. A lot of Prophecies used 17" props. The wide spaced gear sure is easier on take offs and landings. Leave the gear down and locked, cover the gear wells. In the 1999 Nats a lot of Prophecies were weighed in with full fuel. Weight is not a problem.

The Prophecy fell out of favor when the Widebodies became popular. Widebodies became popular as more powerful pattern engines became available. The judges are currently in love with the Widebodies and the National/International will only allow the chosen few a chance. If you can get by that. there are a lot of airplanes that are great performers. The Sequel/Prophecy will cost a lot less to build and maintain due to lower power requirements and much more durable design.

The Hydeout that Ryan sold would be a really easy conversion with its big nose.

If you need to be a Top Contender in the Masters or FAI competition The Sequel/Prophecy or any of the other "Barracuda" Class planes won't do. If you want an affordable, great flyer through Advanced, IMHO they should be your first consideration.

BTW, As soon as I can bench test them I have 4 YS 140's to sell with the "best" at $250 and the " ? " at $200. I am not aging gracefully and I can no longer deal with the wet engines at the field.