Yea but they sell the DIY pods for doing A-Pillars for a couple bucks, so I wouldn't have to fill and shape as much.
I would suggest, (and NOT that you wouldn't already do it) - BUT - before you go to perminently glue / epoxy it all together, mock it all up first. Get it all situated, sit in your car and move stuff around. Adjust the steering wheel, the seat and everything around the cluster that you might futz with once in a while. You may need to trim down some parts of the pods or the cluster surround. Once you're happy with the placement of the pods, then secure it down with masking tape. Carefully remove it and epoxy / glue it down. If you're REALLY anal, you can start the gluing / epoxying while it's still in the car, so it doesn't shift while you're trying to remove it.
JFYI...the thicker saran wrap (which usually comes with various types of printing on it), will NOT stick to JB Weld. So, if you put that stuff down first, if it drips or gets messy, the cluster will come out really easy. You don't want to be gluing the instrument cluster to your dash.
Whatever you do (again, not that you wont), post up some pics! I'd love to see it!!!