James,
I think I have my "list". Where I cannot exactly say which was first, I have choices -- you get a vote to ensure diversity of entries (most all of us did a Spitfire 1st, I'll bet). My "presentation" would start at Airfix-aircraft back in the late 50's - early 60's, then jump to the 2005-present .... Of course you know that when I say CBK aircraft, they weren't CBK's back then but that's Ok ....
My first CBK = my first CBK Airfix = my first CBK aircraft, and would be one of the following late-50's, early 60's. I have listed in release date sequence, which is not necessarily buy/build sequence. I suspect that I did a single-engine before multi-engine, but who knows as I had been modeling for a bit. But I ramble ....
Spitfire IX - have one to build
Hurricane IV RP - have one to build
Mossie VI - have one to build
Wellie III - have one to build
Lanc B.I - have one built, OOB, G-George
Sunderland - have one to build (the one I sent CC SIG is junk & suffered damage enroute)
Defiant - have one to build
Whirlwind F - have one to build
My first CBK Matchbox = aircraft wasn't until 2005, but it has ties to Oct 59 Aeromodeller for a decent story.
Stranraer -- I have one completed that needs dusting, rigging repaired, and one missing Vickers located
I also have several fighters (Spitfire, Hellcat, Hurricane, Lysander, Fury, Siskin, Gladiator) done about the same time.
My first CBK FROG = aircraft was done for 101 Gems; not much of a story on either.
Swordfish -- if good enough, you have this in the Gems collection still, or I have another one started.
or maybe the
Whitley -- CC SIG has this one ....
My first CBK Auto was done for 101 Gems; no story, just an assigned task.
Matchbox Auto Union -- you may have this in the Gems collection still; IIRC I had difficulty getting the body to stay mounted and it sprung apart in transit and you had to repair it. If not good enough, I have another I could build .. and maybe get right ...
My first CBK Ship is still sitting on/near my workbench, over 75% complete. No story to either but a choice of:
Airfix HMS Ajax -- the unfinished boxart display from 2012; could be done as just a model (although I might have to tidy up the hull below waterline) or I could finish the boxart display .... OOB plus WEM Photo-etch
Airfix HMS Iron Duke -- unfinished from Ship GB; is very close. It has WEM PE and I reworked the top to better represent a WW1 era configuration, see the Ship GB for details ....
My first CBK armor is from last year, or this year ... no real story
Matchbox Churchill AVRE SBG -- my first was the pure SBG done for Blitzbau XI, August 2012, the second was the "folding SBG" done for this years Braille GB ....
My first CBK rail were done for Gems, you have them, no real story other than I like them ...
Airfix Brake Van
Airfix Meat Van
My first CBK figure is the infamously unfinished
Airfix Riflemen for last year's boxart; I can finish one or more, even the display; well over 50% complete
So, I have 8 "first" categories listed, and under a few choices of "first" model. It's probably best for you to pick what you want to when you see what others have so we get some diversity. I'm ready to swear on a stack of instruction sheets that anything you pick really was "first"
The good news, given my spotty last-minute, performance is that some are done & over there, and many others are mostly done. I am, this year, keeping my bench clear to make this happen earlier, not later, and not embarrass myself & the SIG as last year ....