Wheelbase

Considerations

The compromise with wheelbase is that a longer car makes packaging easier, but makes the car less maneuverable. The steering angle required to make a turn can be estimated by 57.3*arctan(wheelbase/turn radius). 

You should make your wheelbase as short as you can, while being able to fit all of your components inside. To start off, make a rough solidworks sketch:

You probably won't know exactly how big everything will be, but use the CAD models of last year's car to get a rough idea. The model of the person is based on the "Percy" template that is specified in F.5.6.6 in the 2025 rules. 

One last consideration for wheelbase is how your mass is distributed relative to your wheels. The car on the left will be more responsive than the car on the right, because its wheels are positioned to overcome the car's inertia. With the car on the right, all of the mass that sits outside of the wheelbase will make it harder for the car to rotate.