All the aircraft you mentioned earlier Mark have possibilities, the Caproni Ca.3, the HP 0/400, the Vimy and the Felixstowe, these would all make wonderful kits but whether there would be a market for them is the big question. The main issue with these large aeroplanes is the size of the completed model, they are huge and take up a lot of space. The Gotha is a classic example of this, many modelers have said they would love to buy the kit but would never build it because of its size, I have one in my stash and it will probably never get built. The planned release of the Wingnuts AEG will be a welcome addition, not an overly huge aeroplane but still large enough to make an impact, I will certainly be building one when they are finally released, I'm hoping for a pre christmas release.
Des.