Lovely work that I am following with interest...
In regards tracks, the ones you showed appear to be identical to Pz I tracks... A few years ago I found this advert:
"Here are new production Tracks for the Panzer 1 and Opel/Ford Maultier German Halftracks, exact copy, with pins, very nice, and nowhere else for sale! Call or Email Erik on: 0031617946119
info@greenparts.nl"
I suggest you check and see if they have any available still.
Have fun
Tony
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1942 Chevrolet C60L WO48 - (Workshop)
1944 F15A
1965 Workshop Platform Trailer, Binned ARN: 101-803
1967 Trailer, 1/2 ton AUST No 5 ARN: 154-748
1990 Perentie 6x6 ERV, ARN: 51-981