Unit Graphics Question

[Stardog765]

Hello all. I am amazed by some of the great work here and wanted to ask the pros some advice.
I am just getting into this game for the first time and while I love the graphics of the units sitting on the map I would love to have a set that was smaller that "appeared" more realistic in scale if possible. I know its not supposed to be a realistic scale and i am not saying I want it to be but I would like something smaller and closer.
How hard would it be to do that or is it even possible?

Thanks for any advice you can give.