It looks like someone has a REAL KA 8 plan There , Then .
Not really, just a few pictures from the plan and two 1:1 A4 copies of the canopy area.
For me enough to reconstruct to a level I was happy with, judge for yourself when looking at my photo.
I think I got closer in looks than the american existing plan. That is further off, IMO.
Another point: the KA-8 and -10 are NOT in line designs, close, but not entirely.
The motor and stab are, but the wing is (if I remember correctly)~ 8mm below the center line.
As you can see on my plan, I took some off of the fin, looked more balanced on my model.