Nice, glad to know there's other brave souls that choose the Big Rewrite path, despite the latent idea in our industry that every one of those projects are meant to fail.
In this case I am avoiding the 'throw it all away and start from scratch' approach. It would be infeasible for the intervening period. I am putting together an approach that would get us there in a year or so, but we can lop off smaller chunks to rewrite (the existing architecture is a series of daemons, which helps us there).