modeling multi-resolution data sets

I worked today on our Herschel side project, in which Lang and I attempt to model the dust emission in the M31 disk at the resolution of the Herschel 100-micron images, but using information from all the bands out to 500 microns, which are much lower in resolution. It all seems to work! But we need ways to test the results. Ideas that have come up include: Check that we reproduce the extinction map. Check that we predict well 70-micron and 1-mm data. Check that we don't find strong A_V vs temperature variations. Any other ideas? We get good residuals internally to Herschel, but obviously external tests are much more valuable.