With the discovery of almost 3000 exo-planets it is clear that planet formation is a by-product of star formation, yet in the micron ? cm size range, where relative velocities are just a few cm s-1, we still do not know how particles ?stick? forming larger ?boulders? until gravitational interactions lead to planet formation. It is postulated both ice-coated silicate aggregates may be the key. Here we propose to exploit the unique NIMROD fast acquisition times and wide Q-range to measure the meso-scale porosity of icy grain analogues, the aggregate granularity and porosity, concurrently with the inter-molecular bulk structure, and the subsequent evolution of the grains on heating. This will characterise particle size, shape, porosity and crystallinity vs amorphicity distributions, vital parameters when studying particle collisions and converting empirical data to planet forming models.