Nice one Barry. If you could give us an indication of the overall footprint - when you know it - buyers can then look at possibly sourcing a larger base size (50/60x20 perhaps). Hmmm, could you even include a bigger base in the pack if needs be?
Now, the obvious question is 'what next'? Dare we ask for a Skav, errm, Ratmen army from your goodself?? It's the one army that there are no decent alternative figures for.
Edit: Perhaps as part of this Kickstarter something simple, say a Rat Swarm, to gauge interest in a Ratmen army? The swarm is not something that is available elsewhere and thus could be a useful extra to aid sales on your website even if you didn't go on to produce a whole army.