Gotcha. For layering on top of already set up epoxy, be sure to sand down every bit of 'glossy' surface on the bottom of the pan, remove all dust and clean with acetone. Its crucial that the surface you are going to be adhering to has no glossy/shiny bits for proper adhesion.
For glassing the two together, I would recommend cutting a few strips of cloth to overlap the joint. 2 layers should be enough, but you can judge how thick/strong you want it to be. You can either do small patches (like 'spot' welds) or run the whole length of the joint.
For mounting, I epoxied in rubber isolated grommets from the hardware store and thread bolts in, its not the most convenient thing to get on/off though. You can also epoxy in any other type of 'quick release' systems. You can use the same method of using cloth to help strengthen the joints when you mount the studs in as well - cut a small circle with a hole for the threads/stud, and be sure to tape the stud off.