Panzer IV 1：16 3d print design drawing, double differential steering

this is a Panzer IV german world war 2 kugelblitz tank design drawing for 3d print, most detail have been fixed no further polish required .
rending from Panzer IV Kugelblitz (FLAK), scale1:1
except those print part, you will need:
8 pcs stainless steel axle for the differential: 4mm diameters, 10mm length
16 pcs stainless steel axle for the road axle: 2.4mm diameters, 20 mm length
0.6 mm spring wire for the suspenstion spring and tracks
N20 standard motor for turrent and differential
bearing : 4x7x2.5mm 16 pcs / 4x8x3mm 20 pcs / 5x8x2.5 12 pcs
Screw : Nylon M2 100 pcs
Araldite or 502

please take few moment check this video https://youtu.be/fYNN_6zREaU before your assembly them, keep in mind they were designed to assembly in a specific order, try to solve the puzzle.
there will be a complete video in few days post on youtube. my dumb machine currently not working.
this model is for free, print by yourself will cost less then 100 usd, together with the German early production Tiger 1 coming in about 2 weeks . already finished design work check the photos. it share the same differential with paner iv. those 2 model took a month time so no further update, update design for differential and gearbox will apply to the late production tiger 1 and Tiger 2 also known as King tiger.
feel free to comment if you interesting to know why some componts design in that way and how to assembly
I work for a company design and manufacturing ABS+PC 18650 battery pack ,new to 3Dprint, this brand will represent our tank toys, RC aircraft and architectural model , we will make sure they were cheap , and fun in a special way.