This is definitely a Pat French Jungmann as I built and flew mine back in the early eighties and I had it for about six years when I gave up the hobby for a while and sold it
It flew very well upright and inverted and will knife edge as well with ailerons only on the bottom wing and i flew it on an OS 40 FSR with Sanwa radio
The C of G was found easily as the centre ply support for the top wing had a V-shaped notch on the underside in the middle of the underside so that all you had to do was place a dowel in the notch and lift the plane up to see how it balanced
I notice in the photo (with the wing off) that the notch is missing but it was there on the original part and centred on the underside of the support
This plane flew so well that in a stiffer breeze it could even be hovered
The tail is not bodged and is original as it did have these large curved edges
I have a couple of pics somewhere and will look them out and upload them to let you see
Great to see this lovely model again after so long