I use a little different type of system, this is 2 of my German tray layouts, I have one more for all the other AFV, I group them by AC (two slots) and then by Tank, AG, and TD, by gun size/year. I have 2 more trays for the black SS, and one smaller tray for the blue SS and one for BFP and one for CH SS/Blue counters, so my German kits is in 8 planos, but mostly only use the 3.
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You have to remember that for these three German blue trays I have BV1, BV3, RB, KGP I/2, VotG, FB, SK1-3 + Expansion, Journals and Special Ops counters thrown in