Thanks for the input there guys, looks like this little idea may work with some tweaking (although it may be a challenge as figures are not really my speciallty...)
Stephen - as always you have used a very clinical eye and have pointed out a few things I would have missed

Many thanks!
I would like in this case to try and have a crack at some decent figure painting, so I would like to emphasise the figures and the light hearted moment more than the aircraft. As such, I would really like to do this one as a small vignette - however, I do know that I am very much not a figure painter yet... so... to that end, before chopping up a nice model, I will try and paint the figures first. If they come off ok, I will stick to the vignette idea, if not, they will make a nice complement to a model at some stage.
So, assuming I can get the figure painting right...
Based on your logic regarding the tail plane, I think I will use the pfalz as the "platform" for this vignette (pardon the pun). As well as getting around the fabric tailplane issue, it seems to work better with the figure and doesn't dominate the scene like the larger Albatros tail does.
On the title, I do like your idea of telling the story through the title, and I agree that it will help tell the story. I would like the German phrase to be used as the main title (but my German is very bad...).
I am thinking perhaps of titles that imply a teacher / student role, with a cheeky question as to which of the figures is really in charge:
1. "Der kleine Lehrer" ("The little teacher" - based on Stephen's suggestion)
2. "Der Lehrer" ("The teacher" - simplification of the above)
3. "Lehrer und Kursteilnehmer" ("Teacher and Student")
4. "Wer unterrichtet, wem?" ("Who's Teaching Who?)
Or, some others:
5. "Lernen der neuen Sachen" ("Learning new tricks")
6. "Der neue Flieger" ("The new pilot")
7. "Der neue Wiedereinbau" ("The new replacement")
8. "Folgendes Mal, bedecken mein Endstück!" ("Next time, cover my tail!" - I quite like this one as it ties in with the pilot theme, the fact that the dog is actually resting on the tail, and the fact that the dog also has a tail... ok, simple things....)
BC