Hi and welcome Chris, nicely varied subjects you got
Ah yes , 'varied' is my middle name
Oh. No. Wait.
My middle name is '-the-'
ACTUALLY, many years ago I came across the idea of 'thematic' collections - rather than 'ooh, that's pretty - I'll have one of those!', or, to show my age, building each Matchbox kit in numerical order as released, but to collect/build by trying to keep to a theme - then I found a complete set of the old Supermodel Italian aircraft at a particular old model dealer in soutg London and so...
Now I've got most major Regia Aeronautica types, many, many lesser types, foreign bought and war prize 'planes - basically anything that flew with the fasces roundel, and here's my main proviso, so long as they flew in Squadron service. War prizes allows me to justify the odd Blenheim IV or Beaufighter IF too. Still haven't found a 1/72 Albacore... A DECENT Albacore - I may be a modelling masochist but two old Pegasus biplane kits was too much...
How many of my RA collection have I finished though...?
Hmm, I did find a thread here about the difference between a builder and collector...