I figured as much. Thank you Michael, much appreciated. I wouldn't mind using the aluminium because A) it gives me a chance to try and do some metalworking, even if it's just aluminium, B) it gives me a reason to use the cans of diet cola and energy drinks I have lying around, and C) if everything goes well, I can just remove, hammer out the kinks and put it back on whilst the batteries charge and the typical damage checks haha.

Well, as of right now, I'm really sketching out about the wheels. I'm not sure if they're even on properly, like how cockeyed it is when it's mounted, how to keep it on the axle itself, how to add the rubber to the wheel itself, and such. The wheels you see on the bot right now is what I cut out of that sheet, as explained a couple of posts/videos, and honestly, the quality of my cutting is absolutely friggin' shocking.

My questions are... what's the best way of mounting wheels to the drill axle? Is there a better way of cutting out the wheels? Because they need to be at least 12.5 cm to 13 cm in diameter. Or are there wheels that size that I can slip onto the drill without problem?