Peter, your colourful shot is the most unusual image I have ever seen of the most popular
APS Tomboy design. I have never heard of one being setup to fly backwards, but yes the wing is on backwards and likewise the tail. Clear tip plates have been added - Mmmmm. A fair bit of weight has been added for balance I see.
It was designed about 55 years ago by the late Vic Smeed in the UK who designed dozens of model aircraft and almost as many model boats.
The design is one that is very easy to get to fly and it is often one of the first built by those starting out in aeromodelling and it is still popular today.
Why don't you submit this image to the UK "Aeromodeller" magazine under the caption of "The most Unusual Tomboy"?
The Tomboy is a design still flown in SCRAMBLE competions. The engine is usually a 0.75cc diesel, although many now have electric propulsion.
(Confessions of a lapsed aeromodeller and yes, I am well and truly off topic, but it is funny what an image can do to a person.)
This plane was built as a sort of a joke.
The builder and his dad makes and sells these kits, and wanted to show that it would fly, no matter how badly you built it.
So they built it to fly backwards...