Sorry if this has already been suggested.
After you research a specialization… it would be nice if you could select more than one station at a time. For example, after you specialize chassis, you could have the option to drag out a Fit Axles station and a Fit Undercarriage & Fuel Tank station. Maybe add check boxes beside the stations so we can select more than one station at a time to drag onto the floor.
Great game! Thanks!