I did - but I found myself going down a rabbit hole......... having found a way I can make axle kits for 7mm, I wanted to see if I could make them for 4mm, and then could I make even narrower axles for 4mm..... etc..... (All on the laser cutter, with bearings on stub axles).
Then of course my favourite motors became unavailable, so finding a reasonable substitute...... These 100rpm gearmotors are about £3.50 A piece, and perform as shown - however, when you tweak the transmitter (A Jumper TSG8 or whatever..) The characteristics get even better, and more realistic.