Hi Sitsia, welcome to eurobricks!
I built my buwizz version recently, and it drives pretty well.
As been pointed out in the Buwizz thread, 4 L motor stacked on single Buwizz output would be ok in normal mode. But for fast mode, 2 outputs would be better.
I used 2 outputs for driving, 1 for steering, and 1 for mode switching. Since there is no output for the winch and light, I just simply removed them. It's actually not bad to focus on drive
I also added a clutch gear on the mode switching axle to prevent gears from getting damaged under high torque. And I moved the m-motor to the back side to make some space for the driver seat.
I hope it helps.
And thank you Madoca for brought us so much fun by creating this model!