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Have you tried building Fujimi's Pz I? Those are smaller and have interior parts
Not quite correct. Fujimi make two different 1/76 Panzer IB kits -- one is an ex-Nitto and the other originated with Fujimi.
The ex-Nitto kit has the (not very accurate) interior (which cannot be seen in any case, even with all the hatches open). The hull shape has accuracy issues also, particularly on the rear upper deck. The kit includes a Kubelwagen and a BMW with sidecar.
The other kit has no interior but is very accurate overall -- indeed it is the most accurate injected-plastic braille-scale kit of this vehicle, period. Somewhat bizarrely, the kit also comes with a PaK 40 anti-tank gun.
This second kit was the basis for the PzJg.IB kit, which does feature a basic but generally accurate interior -- which puts it miles ahead of the ESCI kit, which features no interior at all (or even an open superstructure)!
With the only 1/72 kits of the Pz.IB vehicle series being the ancient ESCI kits, this scale is well-overdue for a more accurate and more detailed line of kits! The ESCI kits are OK but have some shape issues (and as noted the PzJg.IB kit needs a lot of scratch-building work to even approach being accurate).