John,

the link you provide actually seems to state that 2 stroke 1.2 (120) glow power is called for. A quick search on the net revealed this site:

http://www.zen33329.zen.co.uk/Gallery1.htm

which shows Terry having used a RE Webra 120 (red head) in one of his models. It appears that only later was the OS 140 RX substituted in place. RE engines are hard to come by in any size as the engine community in general has mostly stopped making them but a Webra should be obtainable if one looks. On the other hand, it is probably easier to find an OS 140 at a decent cost which would probably be lower than any 4 stroke 1.4 to 1.8. A few builders on the forum have recently sourced RX's in the build of Akiba Wild Beats which are also very close to 2m aircraft. A design like that would be quite easy to convert to electric power reason for which they might have the plan listed under electric.

BTW, using a side exhaust 120 2 stroke makes things a fair bit easier in terms of engine options. It can be mounted inverted with a swan neck header, mounted at 8 o'clock with the cylinder exposed from the cowl or simply mounted inverted with a regular muffler.

I think that in the UK when they say "wing and tail" in the context of foam cores, they mean wing and stab cores. It is possible that the vertical might also be constructed using a foam core - always an option with airfoiled verticals.

David.