Louie, those are 1"/25mm bases they're on. They're 1.25"/32mm to 1.5"/40mm tall. Depending on how you like things to scale they'd work with 6mm to 10mm figures.
Grimmnar, there's just not a lot there and everything just seems to be tied to the size of the mech.
The weapons are what they are, you can't change their range or abilities. The size of the mech you strap them to determines their damage. The size of your target determines how easy it is hit. There's no saving really, just generate a pool or dice for an attack and the defender rolls that number of dice looking for a number to avoid damage.
You can adjust two values on a mech, armor and super-structure. Bumping either up from the standard for the size of mech you're using. That's about it though, your move is your move.
There's no real decision points beyond every other game has: where should I move and who should I shoot.