Kind of a mash up of a couple of existing models/ideas but with a couple of tweeks.
[UPDATE 2018-04-17: there is now a second templateHolder
...さらに表示 (templateHolderTight). ALL of the slots have been reduced by 1.75 on each side (internal left-right, total 3.5mm overall). I have not printed one of these, but makeprintable says it's green so [thumbsUp]. ]
Obviously you've got the movement template holder bit which also includes a slot at the back for your weapons range stick (pic 2 and pic 5).
There's two card holder bits, one for card o'natural and a slightly larger one for cards with protectors for those who prefer to engage in safe card.
Finally a little connector rod that connects the two. NOTE !! you will need to sand this back so that it fits into the bevel on the bottom of the main bits (pic 4).
This provides a bit more stability to the whole unit via the extra weight.
You could also use the template holder combined with just the connector rod poking out the back as a stabiliser (pic 3). Not sure how crucial this is but someone at the FLGS mentioned it one time. It works.