Hello Erik.
I do not complete to built Airfix RE.8. But I checked up it with Windsock data
file and some resources.
I write some points from memories.
1. Shape of vartical tailplane. In particular rudder.
2. Propeller. I recommend to replace metalparts or Airfix DH4's propeller.
3. Adding buldges at underneath of nose. The kit has no buldges.
4. Too long span of both upper and under wing.
5. Too deep cut of cockpit. For that reason, shape around of cockpit is inaccuracy.
I will check it again tonight.
Hope this help.
Cheers!
--Hirohisa Ozaki