I've played with the bevel options a bit, since I'll probably just have the base laser cut and weld the center into it, I'm just going to round off the corners, then add bevels onto the edges by hand.
Am going to make one that allows for the stock mesh/honeycomb too, whilst I know that most folk regard it as a unecessary item, we find it acts as a stabiliser over here, cuts down a lot of turbulence in the intake charge, giving a better reading at the maf.