I aksed DPA a bunch of questions about the 5100 while back. The front L/C/R triplet are coincident, for good 2-channel/mono mix-down compatibility as this mic is targeted primiarily at video applications. As I understand it, all caps are omni based- the sL/sR back pair are baffled and near-spaced 406x. The coincidently arranged front triplet uses interference tubes along with the baffling to provide directionality. Designwise, the use of interference tubes on omni mics is the interesting and unusual aspect for me, the rest is clever packaging and conceptually not that different than an extension of the techniques many of use around here.
I was told that the front omni caps are different than standard 406x and the interference tubes are not available as replacement parts.. you can probably see where I was going with that.
As for a suitable hat.. form follows function: