Very cool!
If you ever decide to try it, you can set up the Crimson kit with the DM10 as a kit with many pads.
Use both modules and, if you want to hear DM10 sounds from any of your Crimson pads, change the midi note for that pad to one of the 'free' notes in the DM10 and assign whatever sound you like. See rhysT's link for more info.
I daydream about that in this post - just know that a Crimson kit is essentially a Command kit
My DM10 already has 2 8" toms, 2 10" toms, and a 14" diy snare, and I'm happy with that. I'm a novice drummer, and don't have plans to play anything that necessitates more pads. I would like to add a surge crash or two to it, then it will be complete. I actually did swap some of the rack tubes and all the tom rack mounts. With my DIY hihat stand (i'm uploading the photots for a DIY post as I type this, I now have an extra rack mount cymbal arm and anti-rotating piece for a 3rd surge. The crimson module is meh to me. it only has hihat open and closed, and the sounds aren't much better than the DM10. However, it will be great for a beginner since it's pretty much plug and play unlike the DM10 module.