I hear what you are saying Des. And if I may, add my two peneth.
My gut feeling will be that the basic cost of the kit will not be that different than the Gotha, maybe $30-40 more. Tooling costs have by the by remained pretty flat the last few years. And once the moulds are cut you are talking a unit cost of pennies to injection mould a few hundred sprues. What will affect the tolling cost price is the parts count, which is lower for the Felixstowe, but that will be offset by the fact that some of the parts are bigger.
What will bump up the cost for WNW and ultimately us is the shipping costs. I seem to recall that WNW have in the past said that the rise in shipping costs has affected them, and that has been reflected in the cost of the later kits, and to a degree the speed at which they land in our home, once we order them. Looking at the size of the Felixstowe's box has me convinced it will be an expensive kit to ship.
The AEG will differ from the Felixstowe in one way, it will have (I'm assuming here.) a much more elaborate decal sheet. Dazzle after all is a lot easier to paint rather than night lozenge.
Still, I'm sure, as you are too that it, like its stablemates will represent stunning value for money. I doubt very much that it will be above $200, and suspect that it will come in at less than $180. Time will tell. Either way I'm having one.
Best,
Adrian.