Thank you for the ideas. i can think of another reason to use those foam circles: support the back of the reflectors, and perhaps they can do double duty. It looks like you dug out a hole to fit the transceivers, one in each?
I'll attach a shot of what I realized I had right in front of me: a chambered nut and screw holder on the top of the Stanley tools rolling case i use to carry the Einsteins to shoots. The little transceivers lie on foam under a clear hinging top and I (or more important) an assistant get an immediate visual scan: are all the units there?
http://jonathanrawle.zenfolio.com/einsteincarryRight now the Cyber Commander *almost* fits -- but not quite -- so have to carve out one of the partitions to accommodate it.
I am not flying to shoots with this rig, but I suggest that this rolling box is great for driving to shoots. Look how the handle pulls out from which it is pulled behind you. 4 Einsteins in their soft cylindrical bags, some softbox rings as extras, an extra cord, and (in a pinch) a couple of honeycombs. Usually I have all the reflectors, honeycombs, extra tubes, scoop reflector, etc., in a old Tenba boxy 20" high padded case (shown) that was intended for power packs the size of a Norman, say, 800D or the bigger Dynalights, Speedotron brown (if you're old enough to remember those(!). Anyway, I got it used and it serves well for the lighter pieces.
The Stanley box was, until recently, available in my island's HomeDepot stores but they decided not to carry what appears to be a continuing product.
jonathan7007