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Hi and thanks, nice to know that you liked it. For the master wheel problem there is this solution SMARS modular robot - modified wheels found on #Thingiverse https://www.thingiverse.com/thing:2732013.
For the tracks you can melt the filament so it becomes like a rivet. I didn't understand what's exactly the problem with the slave wheels, do you have the chassis SL or the chassis S?

SMARS modular robot - modified wheels