Currently there are no individual kit costs for the Kickstarter as everything is assigned by pledge amount. Individual stretch goals will be priced accordingly though, but currently that is yet to be determined. We will aim to provide a cost for currently prototype only kits to backers ASAP.
If the project goes beyond expectations then yes there may be some slippage in delivery times. Obviously if this was the case we would let everyone know as soon as we knew we wouldn't be able to meet our target deadline for fulfillment.
However if it became clear that we would miss the target by a significant margin we would split shipping into two or more waves with the first wave consisting of all the products included in the core range which becomes available once we hit the £5000 funding goal. Then the second and any subsequent waves that may be required would be shipped at DFA's expense to all backers.
Yes, the generic HQ and FC building can be changed for any unlocked faction version except the Invader faction (this is due to the larger size of the Invader buildings) during the Pledge Manager. In fact it's one of the questions you'll be asked to fill in along with what type of Resource Building you would like.