It looks like the idea is that, if the kickstarter is ix more successful, various items until then offered in metal will be moved to plastic. Presumably, this would convert various types of infantry first, and then chariots or cavalry.
I think it might be worth considering how much you guys want the plastics out, Watchful I – it seems as it stands there's not many chunky 28s covering Warring States anyway, so maybe demand is enough to get a variety of cheaper-to-produces metals funded via the KS. My own preference would be as much plastic as possible, but it might make more sense to have smaller goals so that, say, 3-4 metal units might be produced rather than 1 plastic, and that way to attract more backers by offering more options all in one range.
One possibility might to fund two plastic body sprues and head sprues, for armoured and unarmoured, and supplement those with metal/resin arm sets. There's a vast array of weapons – spear, javelin, halberd, bow, crossbow, standard pole – in two arm sets – armoured and unarmoured, and that's assuming just one pose for each weapon, though with poseable arms and heads we'll likely get enough variation to make wargames units look nice.
Basically the problem will be either a) tons of space on sprues/material costs of metal for weapons that won't get used or b) paying tooling costs for many very similar sprues with one or two different things like the Warlord Caesarian Romans (which is fine, but perhaps that's the reason their Caesarians are close to double the cost of their Hoplites and Phalangites).
I know we can all convert, but I look at the amount of extra plastic in the latest GW kits that can be configured for two rather different looking units, and it's a LOT of space that could have gone to make 5 more infantry of just one type.
However I'm sure the folks at Watchful I have thought about this; if the KS is going live in a month this stuff is probably planned out already.
