yeah i've been into getting wheelchair motors earlier but I was wondering if theres something in between them and cordless drill ones which would be more of an optimal size.

I didn't mean interference in that way, I meant if there was a risk of the magnetic field of the motors to damage the motherboard's circuits when the PC case is being transported by this robot "platform".
As this robot is just for having a fun way of getting the PC case to the designated table, and then not really using it again until its time to get the pc case to the car.

But as i've thought of it I've seen feathers with dual drill motors pushing around other feathers and therefore moving about 24kg's as a pair then 4 of them should be able to get my 40-50kg's worth of robot + data going. But I'd rather have a little bigger motors to not strain them too much