Major Issues? just a few From memory heres a list of some of the scratch built parts:-
Prop, valves, pushrods, cowling securing cable, fuel tank, ammo bin, compass, rear bulkhead, many, many turnbuckles, top decking, side decking, wing boxes, wing ribs, wing tips, undecarriage torsion box.
It's probably bad form to post to another site, but there is a full build over on Britmodeller here Link
Regards
Nick