Red

I know that using D-Joint is far superior to the LEGO red track inserts when it comes to gaining traction, and I know that you've tried to use them, but what caused you not to show off an attempt with them in one of your videos?

Well, it is difficult to put the D-joint on. So it is better you don't remove them.
The links tread are not so expensive, about 0.06€, so it is better to buy new ones. https://store.brickl...ID":"91081149"}

1.72kg, it is very good !
Yes the battery boxes give more power, it is a good choice. May be one could be enough, you have to try. SBrick is good too.
22cm, this is very good ! How much is the slope ? You can test with cellular phone angle application.
What I use in my first videos looks like cardboard but it is not, it is plastic board. It is better because you can use it outside. You can find them in big store in water bottle pallet, between two levels. Don't forget to make the step stair nosing. This is very important.
In my opinion, the best way is to make stairs with wood.

I am very impatient to see your video.

https://docs.google....dit?usp=sharing

I'm working on a video too!

Will using D-Joint on my tracks affect them permanently, or can it be removed?

How did you make the stairs that are shown in your videos? I'm interested in making a stairway of my own to test with.

22 cm has worked for me so far, I'm using cardboard boxes as stairs, so they might be compressing with the weight of the robot, I'll do some more tests with stronger boxes, and send a video. I have the EV3 brick on it right now, in order to do testing with the sensors, but after my science fair project is completed, I will be taking it off, and work on making it lighter. I've also found that having the 2 larger battery boxes increases the maximum torque of the motors, since they give out 11.4 V of power, rather than 7.4 V, which makes it easier to climb up the stairs. I removed the EV3 sensors, and weighed the robot. It has a weight between 1.7 and 1.72 KG. It appears that the weight of the large battery boxes is offset by the use of the SBricks, instead of IR control.