new wheel loader winter project!

[cosworth34677]

so i want to make a new wheel loader , i got a few things to take of first, but i want it to be big!! not quite mining sized but large like a cat 990k so........


so what would be a good wheel size for something like that?
and gear motors or axles ? and what would be some tips from pro bulders?
i have built a few models and learn what not to do each time but i always like to
learn from guys that have done it before.