Click on the I in the top left corner for full size images
For an explanation on how to do your own mesh head watch this:
As you can see in the concept image, this drum will accept a double pedal just fine.
I also didn't put measurements because that depends on the pedal (or pedals if using a double) because one very well can make 2 of this and join the outputs on a mono/mono to stereo 1/4 cable, or create a custom cable or who knows what else someone may come up with. besides the distance between double pedals depends on the drummer's comfort zone or sometimes where the snare is positioned. So , There you have it, make it as small or as big as you need it.
You can also see the 2 L brackets holding the front of the assembly.
The base is big enough to accept a double pedal and it gives the option of bolting the pedal so that there is no pedal movement and the action is more precise.
The size of the L brackets is optional, personally I am not a heavy hitter, so I don't need to have huge brackets, but I am only using what I have already so maybe instead of L brackets I will use small shelve brackets.
The idea of the rubber matting, is so that the hits on the mesh (Which transfer to the wood), are absorbed by the rubber matting.
This will isolate the vibration a great deal, (for those that live in apartments in the top story). Of course, another layer of wood and a second layer of rubber mat can be added to increase the isolation, or if the room happens to have carpet, that will add to the isolation.
The sidewalls are painted white here for clarity purposes.
If you decide not to mount your drum permanently, you can make some minor modification to the piece in front so that it holds the drum from going forward.
For the electronics, check my other tutorial here: https://www.instructables.com/id/How-to-wire-a-double-zone-snare/
But make some small changes. For example instead of creating a bridge, just a single L bracket, one small bridge which should only be big enough to hold the SINGLE piezo and keep it off center. this will prevent the piezo from getting damaged by the beaters.
Besides, a bass drum doesn't need to have much positional sensing, it will still have some degree of it but not as evident as if the piezo was mounted in the center. Experiment with that to your liking and your module capabilities.
(If you create this, please post a reply with your pictures and results)