Hello again Dazzled
Just in connection with your planned 0/400....
Maybe you've picked up from the Unofficial Airfix Modellers Forum you mention, that the 0/400 kit does have various faults. I've just been flicking back through some old copies of Windsock International. The May/June 2002 edition (Vol. 18, No. 3) contains a re-assessment of what it calls this 'elderly classic', noting faults, in particular with the wings and tail assembly. This may not be something you want to address, but if you do it may be worth trying to get hold of the relevant Winsock Datafile and/or the magazine I mention.
Best wishes
Nigel