Thanks @BashingBrian! I think for the motor I'll definitely go with the Hobbywing Fusion Pro, from all the videos and reviews I've seen it looks really good. For servos I'm probably going cheap from Aliexpress, probably a DSServo 35Kg waterproof, but I'm not sure about the transmission, I'd imagine it doesn't need to be strong for that, 15Kg should be more than enough. Also, just to confirm, this thing takes standard sized servos for both the steering and transmission right?
I think I'm going for the pickup and I'll probably paint it yellow, I like how the yellow they have on their website looks!